drm/amd/display: Adjust some includes used by display

Some of the includes used in the DC can be removed and others need to be
update. This commit adjusts some of those headers in the display code.

Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>