drm/amd/pm/powerplay/hwmgr/hwmgr: Clean up errors in hwmgr.c

Fix the following errors reported by checkpatch:

ERROR: space prohibited after that '~' (ctx:WxW)
ERROR: spaces required around that '||' (ctx:VxW)

Signed-off-by: Ran Sun <sunran001@208suo.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>