drm/amd/display: Enable BT2020 in COLOR_ENCODING property

[Why]
BT2020 is not supported in COLOR_ENCODING property of planes. Only
BT601 and BT709 was available.

[How]
Allow BT2020 as legit value in setting COLOR_ENCODING property.

Signed-off-by: Stylon Wang <[e-mail]>
Reviewed-by: Nicholas Kazlauskas <[e-mail]>
Acked-by: Rodrigo Siqueira <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

···
 	}
 
 	if (plane->type == DRM_PLANE_TYPE_PRIMARY &&
-	    plane_cap && plane_cap->pixel_format_support.nv12) {
+	    plane_cap &&
+	    (plane_cap->pixel_format_support.nv12 ||
+	     plane_cap->pixel_format_support.p010)) {
 		/* This only affects YUV formats. */
 		drm_plane_create_color_properties(
 			plane,
 			BIT(DRM_COLOR_YCBCR_BT601) |
-			BIT(DRM_COLOR_YCBCR_BT709),
+			BIT(DRM_COLOR_YCBCR_BT709) |
+			BIT(DRM_COLOR_YCBCR_BT2020),
 			BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
 			BIT(DRM_COLOR_YCBCR_FULL_RANGE),
 			DRM_COLOR_YCBCR_BT709, DRM_COLOR_YCBCR_LIMITED_RANGE);