ARM: dts: imx6sx: Specify IMX6SX_CLK_IPG as "ipg" clock to SDMA

Since 25aaa75df1e6 SDMA driver uses clock rates of "ipg" and "ahb"
clock to determine if it needs to configure the IP block as operating
at 1:1 or 1:2 clock ratio (ACR bit in SDMAARM_CONFIG). Specifying both
clocks as IMX6SX_CLK_SDMA results in driver incorrectly thinking that
ratio is 1:1 which results in broken SDMA funtionality. Fix the code
to specify IMX6SX_CLK_IPG as "ipg" clock for SDMA, to avoid detecting
incorrect clock ratio.

Signed-off-by: Andrey Smirnov <[e-mail]>
Cc: Angus Ainslie (Purism) <[e-mail]>
Cc: Chris Healy <[e-mail]>
Cc: Lucas Stach <[e-mail]>
Cc: Fabio Estevam <[e-mail]>
Cc: Shawn Guo <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/imx6sx.dtsi

···
 				compatible = "fsl,imx6sx-sdma", "fsl,imx6q-sdma";
 				reg = <0x020ec000 0x4000>;
 				interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
-				clocks = <&clks IMX6SX_CLK_SDMA>,
+				clocks = <&clks IMX6SX_CLK_IPG>,
 					 <&clks IMX6SX_CLK_SDMA>;
 				clock-names = "ipg", "ahb";
 				#dma-cells = <3>;