freedreno/a6xx: re-enable UBWC for depth/stencil

Now that we can blit depth/stencil in a way that plays nicely with UBWC,
re-enable it.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@gmail.com>

src/gallium/drivers/freedreno/a6xx/fd6_resource.c

@@ -194,6 +194,8 @@ ok_ubwc_format(enum a6xx_color_fmt fmt)
 	case RB6_R8G8_SINT:
 	case RB6_R8G8_UINT:
 	case RB6_R8G8_UNORM:
+	case RB6_X8Z24_UNORM:
+	case RB6_Z24_UNORM_S8_UINT:
 		return true;
 	default:
 		return false;