arm64: dts: exynos: Use macros for pinctrl configuration on Exynos7

Usage of DTS macros instead of hard-coded numbers makes code easier to
read.  One does not have to remember which value means pull-up/down or
specific driver strength.
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm64/boot/dts/exynos/exynos7-espresso.dts

@@ -328,8 +328,8 @@ buck10_reg: BUCK10 {
 &pinctrl_alive {
 	pmic_irq: pmic-irq {
 		samsung,pins = "gpa0-2";
-		samsung,pin-pud = <3>;
-		samsung,pin-drv = <3>;
+		samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
+		samsung,pin-drv = <EXYNOS4_PIN_DRV_LV4>;
 	};
 };