tests: subsysm: pm: Enable power_mgmt_soc for MAX32655

This commit enables power_mgmt_soc test for MAX32655 boards
- max32655evkit
- max32655fthr

RTC clocked in most low power modes so that this timer
is linked with idle timer. By this way device able to wakeup
from low power modes.

Signed-off-by: Sadik Ozer <sadik.ozer@analog.com>