crypto: add lz4 Cryptographic API

Add support for lz4 and lz4hc compression algorithm using the lib/lz4/*
codebase.

Modified by ASKP for 3.0.xx
Signed-off-by: Locasto <amperific@gmail.com>

Signed-off-by: Grarak <williye97@gmail.com>

Conflicts:
	arch/arm/boot/compressed/piggy.xzkern