tests: subsys: pm: Add support for power_mgmt_soc on mck_ra8t2

Add support for test app `power_mgmt_soc` on Renesas mck_ra8t2

Signed-off-by: Khoa Tran <[email protected]>

Author: khoatranyj

tests/subsys/pm/power_mgmt_soc/testcase.yaml

@@ -25,6 +25,7 @@ tests:
       - ek_ra8d1
       - mck_ra8t1
       - ek_ra8p1/r7ka8p1kflcac/cm85
+      - mck_ra8t2/r7ka8t2lfecac/cm85
     tags: pm
     integration_platforms:
       - mec15xxevb_assy6853