tests: pm: Change power_mgmt test target

This test implements power management entirely in the application, it is
not using anything from the platform so it can be tested using only
native_posix. Also, there already exists power_mgmt_soc to test power
management on real HW.

Signed-off-by: Flavio Ceolin <[email protected]>

Author: Flavio Ceolin

tests/subsys/pm/power_mgmt/testcase.yaml

@@ -1,11 +1,4 @@
 tests:
   subsys.pm.device_pm:
-    # arch_irq_unlock(0) can't work correctly on these arch
-    arch_exclude: arc xtensa
-    platform_exclude: rv32m1_vega_ri5cy rv32m1_vega_zero_riscy litex_vexriscv
-       nrf5340dk_nrf5340_cpunet thingy53_nrf5340_cpunet bl5340_dvk_cpunet
-    integration_platforms:
-      - qemu_x86
-      - mps2_an385
-      - nucleo_l476rg
+    platform_allow: native_posix
     tags: power