drm/amdgpu: Enable pg/cg flags on GC11_0_3 for VCN

This enable VCN PG, CG, DPG and JPEG PG, CG

Signed-off-by: Sonny Jiang <sonny.jiang@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: John Clements <john.clements@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>