Revert "lib: Add lz4 compressor module"

This reverts commit 72ce0a873ab71f3f3867e237d4afcff4b7be5206.

Conflicts:
	include/linux/lz4.h
	lib/Kconfig
	lib/Makefile
	lib/lz4/Makefile
	lib/lz4/lz4_compress.c
	lib/lz4/lz4defs.h