soc: intel: ace: Fix intel_adsp power down issue when CONFIG_ADSP_POWER_DOWN_HPSRAM not defined

[kartben]

CONFIG_ADSP_POWER_DOWN_HPSRAM may not be defined (when it's "n") so update the code accordingly so that power_down() is called with correct parameters.

Fixes multiple CI tests failing in weekly run.

Simple repro:

west build -p auto -b intel_adsp/ace15_mtpm/sim samples/hello_world -- -DCONFIG_PM=y -DCONFIG_ADSP_POWER_DOWN_HPSRAM=n

Tests failing:

west twister -p intel_adsp/ace15_mtpm/sim -s cpp.main.cpp14 -i
west twister -p intel_adsp/ace15_mtpm/sim -s cpp.main.cpp17 -i
west twister -p intel_adsp/ace15_mtpm/sim -s cpp.main.cpp20 -i
west twister -p intel_adsp/ace15_mtpm/sim -s cpp.main.cpp2A -i
west twister -p intel_adsp/ace15_mtpm/sim -s cpp.main.cpp2B -i
west twister -p intel_adsp/ace15_mtpm/sim -s cpp.main.cpp98 -i
west twister -p intel_adsp/ace15_mtpm/sim -s cpp.main.minimal -i
west twister -p intel_adsp/ace15_mtpm/sim -s cpp.main.newlib -i
west twister -p intel_adsp/ace15_mtpm/sim -s cpp.main.picolibc -i
west twister -p intel_adsp/ace15_mtpm/sim -s net.coap.server.common -i
west twister -p intel_adsp/ace15_mtpm -s cpp.main.cpp14 -i
west twister -p intel_adsp/ace15_mtpm -s cpp.main.cpp17 -i
west twister -p intel_adsp/ace15_mtpm -s cpp.main.cpp20 -i
west twister -p intel_adsp/ace15_mtpm -s cpp.main.cpp2A -i
west twister -p intel_adsp/ace15_mtpm -s cpp.main.cpp2B -i
west twister -p intel_adsp/ace15_mtpm -s cpp.main.cpp98 -i
west twister -p intel_adsp/ace15_mtpm -s cpp.main.minimal -i
west twister -p intel_adsp/ace15_mtpm -s cpp.main.newlib -i
west twister -p intel_adsp/ace15_mtpm -s cpp.main.picolibc -i
west twister -p intel_adsp/ace20_lnl/sim -s cpp.main.cpp14 -i
west twister -p intel_adsp/ace20_lnl/sim -s cpp.main.cpp17 -i
west twister -p intel_adsp/ace20_lnl/sim -s cpp.main.cpp20 -i
west twister -p intel_adsp/ace20_lnl/sim -s cpp.main.cpp2A -i
west twister -p intel_adsp/ace20_lnl/sim -s cpp.main.cpp2B -i
west twister -p intel_adsp/ace20_lnl/sim -s cpp.main.cpp98 -i
west twister -p intel_adsp/ace20_lnl/sim -s cpp.main.minimal -i
west twister -p intel_adsp/ace20_lnl/sim -s cpp.main.newlib -i
west twister -p intel_adsp/ace20_lnl/sim -s cpp.main.picolibc -i
west twister -p intel_adsp/ace20_lnl/sim -s net.coap.server.common -i
west twister -p intel_adsp/ace20_lnl -s cpp.main.cpp14 -i
west twister -p intel_adsp/ace20_lnl -s cpp.main.cpp17 -i
west twister -p intel_adsp/ace20_lnl -s cpp.main.cpp20 -i
west twister -p intel_adsp/ace20_lnl -s cpp.main.cpp2A -i
west twister -p intel_adsp/ace20_lnl -s cpp.main.cpp2B -i
west twister -p intel_adsp/ace20_lnl -s cpp.main.cpp98 -i
west twister -p intel_adsp/ace20_lnl -s cpp.main.minimal -i
west twister -p intel_adsp/ace20_lnl -s cpp.main.newlib -i
west twister -p intel_adsp/ace20_lnl -s cpp.main.picolibc -i
west twister -p intel_adsp/ace30/ptl/sim -s cpp.main.cpp14 -i
west twister -p intel_adsp/ace30/ptl/sim -s cpp.main.cpp17 -i
west twister -p intel_adsp/ace30/ptl/sim -s cpp.main.cpp20 -i
west twister -p intel_adsp/ace30/ptl/sim -s cpp.main.cpp2A -i
west twister -p intel_adsp/ace30/ptl/sim -s cpp.main.cpp2B -i
west twister -p intel_adsp/ace30/ptl/sim -s cpp.main.cpp98 -i
west twister -p intel_adsp/ace30/ptl/sim -s cpp.main.minimal -i
west twister -p intel_adsp/ace30/ptl/sim -s cpp.main.newlib -i
west twister -p intel_adsp/ace30/ptl/sim -s cpp.main.picolibc -i
west twister -p intel_adsp/ace30/ptl/sim -s net.coap.server.common -i
west twister -p intel_adsp/ace30/ptl/sim -s sample.audio.sof -i
west twister -p intel_adsp/ace30/ptl -s cpp.main.cpp14 -i
west twister -p intel_adsp/ace30/ptl -s cpp.main.cpp17 -i
west twister -p intel_adsp/ace30/ptl -s cpp.main.cpp20 -i
west twister -p intel_adsp/ace30/ptl -s cpp.main.cpp2A -i
west twister -p intel_adsp/ace30/ptl -s cpp.main.cpp2B -i
west twister -p intel_adsp/ace30/ptl -s cpp.main.cpp98 -i
west twister -p intel_adsp/ace30/ptl -s cpp.main.minimal -i
west twister -p intel_adsp/ace30/ptl -s cpp.main.newlib -i
west twister -p intel_adsp/ace30/ptl -s cpp.main.picolibc -i