lib/lz4: correct the LZ4 license
The LZ4 code is listed as using the "BSD 2-Clause License".

Change-Id: I1a05ef74aa386a80eab2b28ecff900c39116c57c
Merge "lib/lz4: correct the LZ4 license The LZ4 code is listed as using the "BSD 2-Clause License"." into du44