Revert "Revert "forwardport zram_snappy to updated zram driver from 3.9 (derteufel)""

This reverts commit 6ffda4371d406d27428777e8965a9d1b8d3e024e.

Change-Id: Ibf3d378c1325cf51ce3ae619d799a01bae4b9b24
Revert "Revert "zRam : add LZ4 compression option as alternative to LZO or Snappy compression to use as zRam compression algorithm""

This reverts commit 02d50b2f950d95187bb5acffc3b14bc6f742d3fd.