ARM: dts: exynos: align pin node names in Exynos4412

The DT schema expect pin configuration nodes to have pin prefix or
suffix:

exynos4412-trats2.dtb: pinctrl@3860000: sleep-state: 'gpz-0', 'gpz-1', 'gpz-2', 'gpz-3', 'gpz-4', 'gpz-5', 'gpz-6'
do not match any of the regexes: '^(pin-[a-z0-9-]+|[a-z0-9-]+-pin)$', 'pinctrl-[0-9]+'

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

arch/arm/boot/dts/exynos4412-pinctrl.dtsi

···
 #include "exynos-pinctrl.h"
 
 #define PIN_SLP(_pin, _mode, _pull)					\
-	_pin {								\
+	pin- ## _pin {							\
 		samsung,pins = #_pin;					\
 		samsung,pin-con-pdn = <EXYNOS_PIN_PDN_ ##_mode>;	\
 		samsung,pin-pud-pdn = <EXYNOS_PIN_PULL_ ##_pull>;	\