drm/amd/display: Separate HUBP surface size and rotation/mirror programming

Separate HUBP surface size and rotation/mirror programming so that
HUBP revision without mirror/rotation do not access those register
fields.

Signed-off-by: Eric Bernstein <eric.bernstein@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>