soc: ti_simplelink: build power.c when device PM is enabled
soc: ti_simplelink: build power.c when device PM is enabled

On CC13x2/CC26x2, power.c should be built when either system or device
power management is enabled. Currently it is only doing so for the
former.

Fixes #27392

Signed-off-by: Vincent Wan <7ae6840d3573b56510a1ea731789ea8c898aa415@ti.com>

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