arm64: dts: imx8: fix audio lpcg index

lpcg cell0 should be clock's 'indices' instead of 'index'.

imx_lpcg_of_clk_src_get(struct of_phandle_args *clkspec, void *data)
{
        struct clk_hw_onecell_data *hw_data = data;
        unsigned int idx = clkspec->args[0] / 4;

	....
}

<@sai0_lpcg 1> will be the same as <@sai_lpcg 0>.

Replace 0 with IMX_LPCG_CLK_0 and replace 1 with IMX_LPCG_CLK_4.

It can work at iMX8QXP because IMX_LPCG_CLK_4 is ipg clock, which already
enabled. But for iMX8QM IMX_LPCG_CLK_4 is mclk, which trigger issue.

Fixes: 0a9279e9 ("arm64: dts: imx8qxp: Add audio SAI nodes")
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8-ss-audio.dtsi

@@ -123,9 +123,9 @@ sai0: sai@59040000 {
 		compatible = "fsl,imx8qm-sai";
 		reg = <0x59040000 0x10000>;
 		interrupts = <GIC_SPI 314 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&sai0_lpcg 1>,
+		clocks = <&sai0_lpcg IMX_LPCG_CLK_4>,
 			 <&clk_dummy>,
-			 <&sai0_lpcg 0>,
+			 <&sai0_lpcg IMX_LPCG_CLK_0>,
 			 <&clk_dummy>,
 			 <&clk_dummy>;
 		clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3";
@@ -139,9 +139,9 @@ sai1: sai@59050000 {
 		compatible = "fsl,imx8qm-sai";
 		reg = <0x59050000 0x10000>;
 		interrupts = <GIC_SPI 316 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&sai1_lpcg 1>,
+		clocks = <&sai1_lpcg IMX_LPCG_CLK_4>,
 			 <&clk_dummy>,
-			 <&sai1_lpcg 0>,
+			 <&sai1_lpcg IMX_LPCG_CLK_0>,
 			 <&clk_dummy>,
 			 <&clk_dummy>;
 		clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3";
@@ -155,9 +155,9 @@ sai2: sai@59060000 {
 		compatible = "fsl,imx8qm-sai";
 		reg = <0x59060000 0x10000>;
 		interrupts = <GIC_SPI 318 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&sai2_lpcg 1>,
+		clocks = <&sai2_lpcg IMX_LPCG_CLK_4>,
 			 <&clk_dummy>,
-			 <&sai2_lpcg 0>,
+			 <&sai2_lpcg IMX_LPCG_CLK_0>,
 			 <&clk_dummy>,
 			 <&clk_dummy>;
 		clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3";
@@ -171,9 +171,9 @@ sai3: sai@59070000 {
 		compatible = "fsl,imx8qm-sai";
 		reg = <0x59070000 0x10000>;
 		interrupts = <GIC_SPI 323 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&sai3_lpcg 1>,
+		clocks = <&sai3_lpcg IMX_LPCG_CLK_4>,
 			 <&clk_dummy>,
-			 <&sai3_lpcg 0>,
+			 <&sai3_lpcg IMX_LPCG_CLK_0>,
 			 <&clk_dummy>,
 			 <&clk_dummy>;
 		clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3";