ARM: S5P64X0: Rename GPIOlib file to gpiolib.c

This patch renames S5P64X0 GPIOlib file according to other S5P SoCs.
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-s5p64x0/Makefile

@@ -12,7 +12,7 @@ obj-				:=
 
 # Core support for S5P64X0 system
 
-obj-$(CONFIG_ARCH_S5P64X0)	+= cpu.o init.o clock.o dma.o gpio.o
+obj-$(CONFIG_ARCH_S5P64X0)	+= cpu.o init.o clock.o dma.o gpiolib.o
 obj-$(CONFIG_ARCH_S5P64X0)	+= setup-i2c0.o
 obj-$(CONFIG_CPU_S5P6440)	+= clock-s5p6440.o
 obj-$(CONFIG_CPU_S5P6450)	+= clock-s5p6450.o

arch/arm/mach-s5p64x0/gpio.c → arch/arm/mach-s5p64x0/gpiolib.c

-/* linux/arch/arm/mach-s5p64x0/gpio.c
+/* linux/arch/arm/mach-s5p64x0/gpiolib.c
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