drm/amdgpu: enable VCN DPG for GC IP v11.0.4

Enable VCN Dynamic Power Gating control for GC IP v11.0.4.

Signed-off-by: Saleemkhan Jamadar <[e-mail]>
Reviewed-by: Veerabadhran Gopalakrishnan <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>
Cc: [e-mail] # 6.0, 6.1

drivers/gpu/drm/amd/amdgpu/soc21.c

···
 			AMD_CG_SUPPORT_VCN_MGCG |
 			AMD_CG_SUPPORT_JPEG_MGCG;
 		adev->pg_flags = AMD_PG_SUPPORT_VCN |
+			AMD_PG_SUPPORT_VCN_DPG |
 			AMD_PG_SUPPORT_GFX_PG |
 			AMD_PG_SUPPORT_JPEG;
 		adev->external_rev_id = adev->rev_id + 0x1;