Include support for LZ4 compressed file systems

configname: CONFIG_SQUASHFS_LZ4

Linux Kernel Configuration
└─>File systems
└─>Miscellaneous filesystems
└─>Include support for LZ4 compressed file systems
In linux kernel since version 3.19 (release Date: 2015-02-08)  
Saying Y here includes support for reading Squashfs file systems
compressed with LZ4 compression. LZ4 compression is mainly
aimed at embedded systems with slower CPUs where the overheads
of zlib are too high.

LZ4 is not the standard compression used in Squashfs and so most
file systems will be readable without selecting this option.

If unsure, say N.