omap2: Convert ARCH_OMAP24XX to ARCH_OMAP2

arch/arm/mach-omap2/Kconfig

arch/arm/mach-omap2/Makefile

arch/arm/mach-omap2/clock.h

arch/arm/mach-omap2/clockdomains.h

arch/arm/mach-omap2/io.c

arch/arm/mach-omap2/mux.c

arch/arm/mach-omap2/powerdomains24xx.h

arch/arm/plat-omap/Kconfig

arch/arm/plat-omap/devices.c

arch/arm/plat-omap/gpio.c

arch/arm/plat-omap/i2c.c

arch/arm/plat-omap/include/plat/cpu.h

arch/arm/plat-omap/include/plat/mcbsp.h

arch/arm/plat-omap/include/plat/menelaus.h

arch/arm/plat-omap/include/plat/mux.h

arch/arm/plat-omap/include/plat/omap24xx.h

arch/arm/plat-omap/sram.c

drivers/char/hw_random/Kconfig

drivers/mfd/Kconfig

drivers/net/smc911x.h