arm: s5pc1xx: move SoC to mach-s5pc1xx

MAINTAINERS

arch/arm/Kconfig

arch/arm/Makefile

arch/arm/cpu/armv7/Makefile

arch/arm/mach-s5pc1xx/Kconfig

arch/arm/mach-s5pc1xx/Makefile

arch/arm/mach-s5pc1xx/cache.c

arch/arm/mach-s5pc1xx/clock.c

arch/arm/mach-s5pc1xx/include/mach/clk.h

arch/arm/mach-s5pc1xx/include/mach/clock.h

arch/arm/mach-s5pc1xx/include/mach/cpu.h

arch/arm/mach-s5pc1xx/include/mach/gpio.h

arch/arm/mach-s5pc1xx/include/mach/mmc.h

arch/arm/mach-s5pc1xx/include/mach/periph.h

arch/arm/mach-s5pc1xx/include/mach/pinmux.h

arch/arm/mach-s5pc1xx/include/mach/power.h

arch/arm/mach-s5pc1xx/include/mach/pwm.h

arch/arm/mach-s5pc1xx/include/mach/sromc.h

arch/arm/mach-s5pc1xx/include/mach/sys_proto.h

arch/arm/mach-s5pc1xx/include/mach/uart.h