dts: arm: nxp: lpc55sxx: fix sram node address

[henrikbrixandersen]

Add missing "0" to the SRAM devicetree node addresses to fix the following warning:

CMake Warning at /home/brix/Projects/zephyrproject/zephyr/cmake/modules/dts.cmake:403 (message):
  dtc raised one or more warnings:

  /home/brix/Projects/zephyrproject/zephyr/build/zephyr/zephyr.dts:14.21-44.5:
  Warning (simple_bus_reg): /soc/sram@400000: simple-bus unit address format
  error, expected "4000000"

Call Stack (most recent call first):
  /home/brix/Projects/zephyrproject/zephyr/cmake/modules/zephyr_default.cmake:132 (include)
  /home/brix/Projects/zephyrproject/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:66 (include)
  /home/brix/Projects/zephyrproject/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:97 (include_boilerplate)
  CMakeLists.txt:5 (find_package)

Fixes: #77089