ARM: dts: s5pv210: Add helper define for sleep gpio config

To simplify writing of sleep gpio configs, add a common helper
similar to what is present for other Samsung CPUs.
Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/boot/dts/s5pv210-pinctrl.dtsi

@@ -18,6 +18,13 @@
 
 #include <dt-bindings/pinctrl/samsung.h>
 
+#define PIN_SLP(_pin, _mode, _pull)					\
+	_pin {								\
+		samsung,pins = #_pin;					\
+		samsung,pin-con-pdn = <EXYNOS_PIN_PDN_ ##_mode>;	\
+		samsung,pin-pud-pdn = <S3C64XX_PIN_PULL_ ##_pull>;	\
+	}
+
 &pinctrl0 {
 	gpa0: gpa0 {
 		gpio-controller;