LF-4159-6 arm: dts: imx6sll: add dummy clock for epdc_ahb

add dummy clock for epdc_ahb as it shares epdc driver with imx8ulp

Signed-off-by: Robby Cai <robby.cai@nxp.com>
Reviewed-by: G.n. Zhou <guoniu.zhou@nxp.com>

arch/arm/boot/dts/imx6sll.dtsi

@@ -691,8 +691,10 @@
 				compatible = "fsl,imx6sll-epdc", "fsl,imx7d-epdc";
 				reg = <0x20f4000 0x4000>;
 				interrupts = <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>;
-				clocks = <&clks IMX6SLL_CLK_EPDC_AXI>, <&clks IMX6SLL_CLK_EPDC_PIX>;
-				clock-names = "epdc_axi", "epdc_pix";
+				clocks = <&clks IMX6SLL_CLK_EPDC_AXI>,
+					 <&clks IMX6SLL_CLK_EPDC_PIX>,
+					 <&clks IMX6SLL_CLK_DUMMY>;
+				clock-names = "epdc_axi", "epdc_pix", "epdc_ahb";
 				status = "disabled";
 			};