drm/amdgpu: Remove JPEG from vega and carrizo video caps

JPEG is only supported for VCN1+.

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>