drm/amd/display: make ODM segment width of YCbCr422 two pixel aligned

drm/amd/display: make ODM segment width of YCbCr422 two pixel aligned

[why]
In YCbCr422 format hardware shares 1 set of chromas CbCr with 2 sets of
lumas Y. Therefore each ODM segment needs to be two pixel aligned. The
commit adds this missing hardwware requirement into ODM segment width
decision logic.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>