ARM: dts: imx6ul: Disable gpt2 by default

i.MX GPT driver ONLY supports 1 instance, i.MX6UL already has
GPT1 enabled by default, so GPT2 should be disabled.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6ul.dtsi

@@ -711,6 +711,7 @@ gpt2: gpt@20e8000 {
 				clocks = <&clks IMX6UL_CLK_GPT2_BUS>,
 					 <&clks IMX6UL_CLK_GPT2_SERIAL>;
 				clock-names = "ipg", "per";
+				status = "disabled";
 			};
 
 			sdma: sdma@20ec000 {