Update kernel to V3R3

What changed?
-Reverted ZRAM- from DirtyV, still needs some rework (maybe zswap, zcache and cleancache are related? i should check commits about those)
-ZRAM from staging is back, but it needs to be rewrote because it can't be enabled.
-KSM: check and skip page for already scanned pages (faster KSM and more free RAM)
-Added Google Snappy Compression/Decompression.
-Network Speed Tweaks (thanks ch33kybutt)
-Switched back to stock RCU, we have some commits to check out and to merge. (also JRCU seems to be worse.)
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