drm/amd/display: Clean up some inconsistent indenting

No functional modification involved.

smatch warnings:

drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_mpc.c:116 mpc3_get_ogam_current() warn: inconsistent indenting.
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_mpc.c:445 mpc3_get_shaper_current() warn: inconsistent indenting.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>