soc: smartbond: Move PM_DEVICE dependency to soc

For DA1469x if PM config is selected PM_DEVICE must also
be selected for GPIO to work when device enters/exists
deep sleep.

Previously GPIO and regulator drivers selected PM_DEVICE
when PM was enabled.
Now it is moved to SOC instead.

PM_DEVICE selection in GPIO could result in circular dependency
for mcux if MEMC_MCUX_FLEXSPI (which is already dependent on PM_DEVICE)
was to be additionally dependent on GPIO.

Signed-off-by: Jerzy Kasenberg <jerzy.kasenberg@codecoup.pl>