decompressor: Add LZ4 decompressor module
Date    Tue, 26 Feb 2013 15:24:27 +0900
This patch adds support for LZ4 decompression in the Linux Kernel.
LZ4 Decompression APIs for kernel are based on LZ4 implementation by Yann Collet.

LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
LZ4 source repository : http://code.google.com/p/lz4/

Signed-off-by: Kyungsik Lee <kyungsik.lee@lge.com>
v2:
- Clean up code
- Enable unaligned access for ARM v6 and above with CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
- Add lz4_decompress() for faster decompression with uncompressed output size

Signed-off-by: Paul Reioux <reioux@gmail.com>