add optimization flags

Change-Id: Ia0d15b356ff6dac0b6f5dca612936bcb631993fc
enable various optimizations

use neon and pipe flags
use O3
and some other

Change-Id: I003a614a5d513f56916fc0ca6ce7ce92ad0356f5
defconfig: enable recent changes

and some tweeks

Change-Id: I0b1114e16e19b030a1f9269bcee11354de91aa13