Optimize kernel part 1: Add frandom

Also trim trailing white spaces

Change-Id: I1c4aa54e3ee583ae0cd68a23f146a8070e1ce31a
Optimize kernel part 2: Optimize slub and disable gentle fair sleepers

Change-Id: I35090e7790a3086b852353ae927bf74bf6854411
frandom: make it built in

Change-Id: I4f072de39c70b92aa5d563d9f2ec62a91fc6ae59
Merge "Optimize kernel part 1: Add frandom" into android-4.4
Merge "Optimize kernel part 2: Optimize slub and disable gentle fair sleepers" into android-4.4
Merge "frandom: make it built in" into android-4.4