drm/amd/pm: Clean up errors in smu73_discrete.h

Fix the following errors reported by checkpatch:

ERROR: open brace '{' following struct go on the same line
ERROR: trailing whitespace
ERROR: space prohibited before open square bracket '['

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

drm/amd/pm: relocate the power related headers

Instead of centralizing all headers in the same folder. Separate them into
different folders and place them among those source files those who really
need them.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>