ARM: dts: imx6sx: Add flexcan stop mode wakeup support

Add stop-mode property which is required by stop mode wakeup
feature.
Signed-off-by: Aisheng Dong <aisheng.dong@nxp.com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6sx.dtsi

@@ -451,6 +451,7 @@ flexcan1: can@2090000 {
 				clocks = <&clks IMX6SX_CLK_CAN1_IPG>,
 					 <&clks IMX6SX_CLK_CAN1_SERIAL>;
 				clock-names = "ipg", "per";
+				fsl,stop-mode = <&gpr 0x10 1 0x10 17>;
 				status = "disabled";
 			};
 
@@ -461,6 +462,7 @@ flexcan2: can@2094000 {
 				clocks = <&clks IMX6SX_CLK_CAN2_IPG>,
 					 <&clks IMX6SX_CLK_CAN2_SERIAL>;
 				clock-names = "ipg", "per";
+				fsl,stop-mode = <&gpr 0x10 2 0x10 18>;
 				status = "disabled";
 			};