drm/amd/pm: Clean up errors in smu_v13_0_6_ppt.c

Fix the following errors reported by checkpatch:

ERROR: code indent should use tabs where possible
ERROR: that open brace { should be on the previous line

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