[Why]
MPO isn't enabled on some 4k videos due to video source width is 4096
and the current limit is 3840.

[How]
Changed the limit to 4096.
Signed-off-by: NIsabel Zhang <isabel.zhang@amd.com>
Reviewed-by: NTony Cheng <Tony.Cheng@amd.com>
Acked-by: NBhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>