Added CleanCache and Page Writeback auto tuning screen ON/OFF + MORE!

Tuned SLUB to perform faster!

Change-Id: I26ce4e0f7c61fdde607dacd461b303b63da644ff

Conflicts:
	fs/dcache.c
	mm/page-writeback.c
Update defconfig
Optimize build flags
Upstream timeconst.pl to 3.4.91
Upstream scripts/dtc