drm/amdgpu: enable VCN2.5 DPG mode for Arcturus

Enable VCN2.5 DPG mode for arcturus after below items are applied.
ASD: 0x21000023
SOS: 0x17003B
VCN firmware Version ENC: 1.1 DEC: 1 VEP: 0 Revision: 16
VBIOS: 23
Signed-off-by: James Zhu <James.Zhu@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/soc15.c

@@ -1221,7 +1221,7 @@ static int soc15_common_early_init(void *handle)
 			AMD_CG_SUPPORT_IH_CG |
 			AMD_CG_SUPPORT_VCN_MGCG |
 			AMD_CG_SUPPORT_JPEG_MGCG;
-		adev->pg_flags = 0;
+		adev->pg_flags = AMD_PG_SUPPORT_VCN | AMD_PG_SUPPORT_VCN_DPG;
 		adev->external_rev_id = adev->rev_id + 0x32;
 		break;
 	case CHIP_RENOIR: