drivers: remove legacy mcp23s17 driver

This chip is handled by the more generic mcp23xxx driver, which will get a
microchip,mcp23s17 compatible binding in the next commit.

Signed-off-by: Armin Brauns <armin.brauns@embedded-solutions.at>

Author: arbrauns

drivers/gpio/CMakeLists.txt

@@ -43,7 +43,6 @@ zephyr_library_sources_ifdef(CONFIG_GPIO_LPC11U6X   gpio_lpc11u6x.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_MAX32      gpio_max32.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_MCHP_MSS       gpio_mchp_mss.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_MCP230XX   gpio_mcp230xx.c)
-zephyr_library_sources_ifdef(CONFIG_GPIO_MCP23S17   gpio_mcp23s17.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_MCP23SXX   gpio_mcp23sxx.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_MCP23XXX   gpio_mcp23xxx.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_MCUX       gpio_mcux.c)

drivers/gpio/Kconfig

@@ -133,7 +133,6 @@ source "drivers/gpio/Kconfig.lmp90xxx"
 source "drivers/gpio/Kconfig.lpc11u6x"
 source "drivers/gpio/Kconfig.max32"
 source "drivers/gpio/Kconfig.mchp_mss"
-source "drivers/gpio/Kconfig.mcp23s17"
 source "drivers/gpio/Kconfig.mcp23xxx"
 source "drivers/gpio/Kconfig.mcux"
 source "drivers/gpio/Kconfig.mcux_igpio"