drm/amdgpu: Fix MPEG2, MPEG4 and VC1 video caps max size

drm/amdgpu: Fix MPEG2, MPEG4 and VC1 video caps max size

commit f0105e173103c9d30a2bb959f7399437d536c848 upstream.

1920x1088 is the maximum supported resolution.

Signed-off-by: David Rosca <david.rosca@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Ruijing Dong <ruijing.dong@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 1a0807feb97082bff2b1342dbbe55a2a9a8bdb88)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>