Revert "Default snappy"

This reverts commit 3512533c3d087cefb74e85bbc884764fafd49772.
Revert "ZRAM updates"

This reverts commit 46f67f32d1ef639efafe215aa2564aba0c14ff97.
Revert "staging: Add Snappy compression library (v3)"

This reverts commit dd51a91854f703e69a952e68cd71e09e9d651e15.