arm64: dts: imx8mm-venice-gw7902: fix pcie bindings

Update the pcie bindings to the correct dt bindings:
 pcie_phy:
  - use pcie0_refclk
  - add required clock-names
 pcie:
  - remove pcie_phy clock as it comes from phy driver
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-venice-gw7902.dts

@@ -595,7 +595,8 @@ &i2c4 {
 &pcie_phy {
 	fsl,refclk-pad-mode = <IMX8_PCIE_REFCLK_PAD_INPUT>;
 	fsl,clkreq-unsupported;
-	clocks = <&clk IMX8MM_CLK_DUMMY>;
+	clocks = <&pcie0_refclk>;
+	clock-names = "ref";
 	status = "okay";
 };
 
@@ -604,8 +605,8 @@ &pcie0 {
 	pinctrl-0 = <&pinctrl_pcie0>;
 	reset-gpio = <&gpio4 5 GPIO_ACTIVE_LOW>;
 	clocks = <&clk IMX8MM_CLK_PCIE1_ROOT>, <&clk IMX8MM_CLK_PCIE1_AUX>,
-		 <&clk IMX8MM_CLK_DUMMY>, <&pcie0_refclk>;
-	clock-names = "pcie", "pcie_aux", "pcie_phy", "pcie_bus";
+		 <&pcie0_refclk>;
+	clock-names = "pcie", "pcie_aux", "pcie_bus";
 	assigned-clocks = <&clk IMX8MM_CLK_PCIE1_AUX>,
 			  <&clk IMX8MM_CLK_PCIE1_CTRL>;
 	assigned-clock-rates = <10000000>, <250000000>;