boards: mm_swiftio: swiftio_mm no support pw control
boards: mm_swiftio: swiftio_mm no support pw control

swiftio_mm no support pw control.
remove pw gpio from dts.

Signed-off-by: Frank Li <49244b28ad48c35f973a9a3c4ee9a34d02acfa11@163.com>

finikorg/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,nashif/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,finikorg/zephyr,galak/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,zephyrproject-rtos/zephyr