arm64: dts: rockchip: add emmc-powersequence to px30-evb

Hook the reset line into an emmc-pwrseq for it to get initialized nicely.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20190917082659.25549-6-heiko@sntech.de

arch/arm64/boot/dts/rockchip/px30-evb.dts

@@ -61,6 +61,13 @@ backlight: backlight {
 		power-supply = <&vcc3v3_lcd>;
 	};
 
+	emmc_pwrseq: emmc-pwrseq {
+		compatible = "mmc-pwrseq-emmc";
+		pinctrl-0 = <&emmc_reset>;
+		pinctrl-names = "default";
+		reset-gpios = <&gpio1 RK_PB3 GPIO_ACTIVE_HIGH>;
+	};
+
 	sdio_pwrseq: sdio-pwrseq {
 		compatible = "mmc-pwrseq-simple";
 		pinctrl-names = "default";
@@ -110,6 +117,7 @@ &emmc {
 	cap-mmc-highspeed;
 	mmc-hs200-1_8v;
 	non-removable;
+	mmc-pwrseq = <&emmc_pwrseq>;
 	vmmc-supply = <&vcc_3v0>;
 	vqmmc-supply = <&vccio_flash>;
 	status = "okay";
@@ -364,6 +372,12 @@ hp_det: hp-det {
 		};
 	};
 
+	emmc {
+		emmc_reset: emmc-reset {
+			rockchip,pins = <1 RK_PB3 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	pmic {
 		pmic_int: pmic_int {
 			rockchip,pins =