Correct some warnings in powerMgr
Correct some warnings in powerMgr

Resolves: LE-8368
Change-Id: I7d7605d8d1ba73cb5b1d7f6debfff78b576c20e4
Related: LE-8193

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af