arm64: dts: imx8qm: add dma ss support

The DMA SS of MX8QM is mostly the same as the DMA part in MX8QXP ADMA SS
while it has one more instance for each of LPUART, ADC and LPI2C. And unlike
MX8QXP that flexcan clocks are shared between multiple CAN instances,
MX8QM has separate flexcan clock slice.

So we reuse the most part of common imx8-ss-dma.dtsi and add new things
based on it.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8qm-ss-dma.dtsi

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018-2019 NXP
+ *	Dong Aisheng <aisheng.dong@nxp.com>
+ */
+
+&dma_subsys {
+	uart4_lpcg: clock-controller@5a4a0000 {
+		compatible = "fsl,imx8qxp-lpcg";
+		reg = <0x5a4a0000 0x10000>;
+		#clock-cells = <1>;
+		clocks = <&clk IMX_SC_R_UART_4 IMX_SC_PM_CLK_PER>,
+			 <&dma_ipg_clk>;
+		clock-indices = <IMX_LPCG_CLK_0>, <IMX_LPCG_CLK_4>;
+		clock-output-names = "uart4_lpcg_baud_clk",
+				     "uart4_lpcg_ipg_clk";
+		power-domains = <&pd IMX_SC_R_UART_4>;
+	};
+};
+
+&lpuart0 {
+	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart";
+};
+
+&lpuart1 {
+	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart";
+};
+
+&lpuart2 {
+	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart";
+};
+
+&lpuart3 {
+	compatible = "fsl,imx8qm-lpuart", "fsl,imx8qxp-lpuart";
+};
+
+&i2c0 {
+	compatible = "fsl,imx8qm-lpi2c", "fsl,imx7ulp-lpi2c";
+};
+
+&i2c1 {
+	compatible = "fsl,imx8qm-lpi2c", "fsl,imx7ulp-lpi2c";
+};
+
+&i2c2 {
+	compatible = "fsl,imx8qm-lpi2c", "fsl,imx7ulp-lpi2c";
+};
+
+&i2c3 {
+	compatible = "fsl,imx8qm-lpi2c", "fsl,imx7ulp-lpi2c";
+};