ARM: dts: imx6sl: add "fsl,imx6q-uart" for uart compatible

In order to enable the DMA for some uart port in imx6sl, we add the
"fsl,imx6q-uart" to the uart's compatible property.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx6sl.dtsi

@@ -152,7 +152,8 @@ ecspi4: ecspi@02014000 {
 				};
 
 				uart5: serial@02018000 {
-					compatible = "fsl,imx6sl-uart", "fsl,imx21-uart";
+					compatible = "fsl,imx6sl-uart",
+						   "fsl,imx6q-uart", "fsl,imx21-uart";
 					reg = <0x02018000 0x4000>;
 					interrupts = <0 30 0x04>;
 					clocks = <&clks IMX6SL_CLK_UART>,
@@ -162,7 +163,8 @@ uart5: serial@02018000 {
 				};
 
 				uart1: serial@02020000 {
-					compatible = "fsl,imx6sl-uart", "fsl,imx21-uart";
+					compatible = "fsl,imx6sl-uart",
+						   "fsl,imx6q-uart", "fsl,imx21-uart";
 					reg = <0x02020000 0x4000>;
 					interrupts = <0 26 0x04>;
 					clocks = <&clks IMX6SL_CLK_UART>,
@@ -172,7 +174,8 @@ uart1: serial@02020000 {
 				};
 
 				uart2: serial@02024000 {
-					compatible = "fsl,imx6sl-uart", "fsl,imx21-uart";
+					compatible = "fsl,imx6sl-uart",
+						   "fsl,imx6q-uart", "fsl,imx21-uart";
 					reg = <0x02024000 0x4000>;
 					interrupts = <0 27 0x04>;
 					clocks = <&clks IMX6SL_CLK_UART>,
@@ -209,7 +212,8 @@ ssi3: ssi@02030000 {
 				};
 
 				uart3: serial@02034000 {
-					compatible = "fsl,imx6sl-uart", "fsl,imx21-uart";
+					compatible = "fsl,imx6sl-uart",
+						   "fsl,imx6q-uart", "fsl,imx21-uart";
 					reg = <0x02034000 0x4000>;
 					interrupts = <0 28 0x04>;
 					clocks = <&clks IMX6SL_CLK_UART>,
@@ -219,7 +223,8 @@ uart3: serial@02034000 {
 				};
 
 				uart4: serial@02038000 {
-					compatible = "fsl,imx6sl-uart", "fsl,imx21-uart";
+					compatible = "fsl,imx6sl-uart",
+						   "fsl,imx6q-uart", "fsl,imx21-uart";
 					reg = <0x02038000 0x4000>;
 					interrupts = <0 29 0x04>;
 					clocks = <&clks IMX6SL_CLK_UART>,