arm64: dts: imx8mp: Add snvs clock to powerkey

SNVS powerkey driver needs snvs clock for proper clock management,
add support for it.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp.dtsi

@@ -270,6 +270,8 @@ snvs_pwrkey: snvs-powerkey {
 					compatible = "fsl,sec-v4.0-pwrkey";
 					regmap = <&snvs>;
 					interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
+					clocks = <&clk IMX8MP_CLK_SNVS_ROOT>;
+					clock-names = "snvs-pwrkey";
 					linux,keycode = <KEY_POWER>;
 					wakeup-source;
 					status = "disabled";