arm64: dts: imx8mp-tqma8mpql-mba8mpxl: add missing pinctrl for RTC alarm

Although the RTC is on the module, the RTC_EVENT# signal is connected
on the mainboard. Already set by bootloader, but make it explicit in Linux
as well.

Fixes: 418d1d84 ("arm64: dts: freescale: add initial device tree for TQMa8MPQL with i.MX8MP")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql-mba8mpxl.dts

@@ -394,6 +394,8 @@ &i2c6 {
 
 &pcf85063 {
 	/* RTC_EVENT# is connected on MBa8MPxL */
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pcf85063>;
 	interrupt-parent = <&gpio4>;
 	interrupts = <28 IRQ_TYPE_EDGE_FALLING>;
 };
@@ -630,6 +632,10 @@ pinctrl_lvdsdisplay: lvdsdisplaygrp {
 		fsl,pins = <MX8MP_IOMUXC_SAI5_RXC__GPIO3_IO20		0x10>; /* Power enable */
 	};
 
+	pinctrl_pcf85063: pcf85063grp {
+		fsl,pins = <MX8MP_IOMUXC_SAI3_RXFS__GPIO4_IO28		0x80>;
+	};
+
 	/* LVDS Backlight */
 	pinctrl_pwm2: pwm2grp {
 		fsl,pins = <MX8MP_IOMUXC_SAI5_RXD0__PWM2_OUT		0x14>;