ARM: dts: exynos: Fix pinctrl definition for eMMC RTSN line on Odroid X2/U3

Commit 225da7e65a03 ("ARM: dts: add eMMC reset line for
exynos4412-odroid-common") added MMC power sequence for eMMC card of
Odroid X2/U3. It reused generic sd1_cd pin control configuration node
and only disabled pull-up. However that time the pinctrl configuration
was not applied during MMC power sequence driver initialization. This
has been changed later by commit d97a1e5d7cd2 ("mmc: pwrseq: convert to
proper platform device").

It turned out then, that the provided pinctrl configuration is not
correct, because the eMMC_RTSN line is being re-configured as 'special
function/card detect function for mmc1 controller' not the simple
'output', thus the power sequence driver doesn't really set the pin
value. This in effect broke the reboot of Odroid X2/U3 boards. Fix this
by providing separate node with eMMC_RTSN pin configuration.

Cc: <[e-mail]>
Reported-by: Markus Reichl <[e-mail]>
Suggested-by: Ulf Hansson <[e-mail]>
Fixes: 225da7e65a03 ("ARM: dts: add eMMC reset line for exynos4412-odroid-common")
Signed-off-by: Marek Szyprowski <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

arch/arm/boot/dts/exynos4412-odroid-common.dtsi

···
 	};
 
 	emmc_pwrseq: pwrseq {
-		pinctrl-0 = <&sd1_cd>;
+		pinctrl-0 = <&emmc_rstn>;
 		pinctrl-names = "default";
 		compatible = "mmc-pwrseq-emmc";
 		reset-gpios = <&gpk1 2 GPIO_ACTIVE_LOW>;
···
 	cpu0-supply = <&buck2_reg>;
 };
 
-/* RSTN signal for eMMC */
-&sd1_cd {
-	samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
-	samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
-};
-
 &pinctrl_1 {
 	gpio_power_key: power_key {
 		samsung,pins = "gpx1-3";
···
 	hdmi_hpd: hdmi-hpd {
 		samsung,pins = "gpx3-7";
 		samsung,pin-pud = <EXYNOS_PIN_PULL_DOWN>;
+	};
+
+	emmc_rstn: emmc-rstn {
+		samsung,pins = "gpk1-2";
+		samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
 	};
 };