Added XZ Compression

Conflicts:

	arch/arm/Kconfig
	arch/arm/boot/compressed/Makefile
	arch/arm/boot/compressed/decompress.c
	arch/arm/configs/ext_config/user_bld.config
	arch/arm/configs/mapphone_defconfig
	init/Kconfig
	lib/Kconfig
	lib/xz/xz_dec_bcj.c
	lib/xz/xz_private.h
	scripts/Makefile.lib
	scripts/gen_initramfs_list.sh
	scripts/xz_wrap.sh