arm: Move cpu/$CPU to arch/arm/cpu/$CPU

Makefile

arch/arm/cpu/arm1136/Makefile

arch/arm/cpu/arm1136/config.mk

arch/arm/cpu/arm1136/cpu.c

arch/arm/cpu/arm1136/mx31/Makefile

arch/arm/cpu/arm1136/mx31/devices.c

arch/arm/cpu/arm1136/mx31/generic.c

arch/arm/cpu/arm1136/mx31/timer.c

arch/arm/cpu/arm1136/omap24xx/Makefile

arch/arm/cpu/arm1136/omap24xx/reset.S

arch/arm/cpu/arm1136/omap24xx/timer.c

arch/arm/cpu/arm1136/start.S

arch/arm/cpu/arm1136/u-boot.lds

arch/arm/cpu/arm1176/Makefile

arch/arm/cpu/arm1176/config.mk

arch/arm/cpu/arm1176/cpu.c

arch/arm/cpu/arm1176/s3c64xx/Makefile

arch/arm/cpu/arm1176/s3c64xx/config.mk

arch/arm/cpu/arm1176/s3c64xx/cpu_init.S

arch/arm/cpu/arm1176/s3c64xx/reset.S