MAINTAINERS: Add Bjarki as pm co-maintainer

Add bjarki-andreasen as second maintainer for power management.

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

Author: ceolin

MAINTAINERS.yml

@@ -3133,6 +3133,7 @@ Power management:
   status: maintained
   maintainers:
     - ceolin
+    - bjarki-andreasen
   collaborators:
     - nashif
     - teburd