drm/radeon: print a message if ATPX dGPU power control is missing

It will help identify problematic boards.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_atpx_handler.c

@@ -143,7 +143,10 @@ static int radeon_atpx_validate(struct radeon_atpx *atpx)
 {
 	/* make sure required functions are enabled */
 	/* dGPU power control is required */
-	atpx->functions.power_cntl = true;
+	if (atpx->functions.power_cntl == false) {
+		printk("ATPX dGPU power cntl not present, forcing\n");
+		atpx->functions.power_cntl = true;
+	}
 
 	if (atpx->functions.px_params) {
 		union acpi_object *info;