Revert "clk: qcom: rcg: Return failure for RCG update"

This reverts commit 21ea4b62.
Otherwise, cheza fails to probe drm-msm.

drivers/clk/qcom/clk-rcg2.c

@@ -131,7 +131,7 @@ static int update_config(struct clk_rcg2 *rcg)
 	}
 
 	WARN(1, "%s: rcg didn't update its configuration.", name);
-	return -EBUSY;
+	return 0;
 }
 
 static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)