2011 Xperias: use LX webview

Change-Id: I778151b5e8287ff4049af71788d7a0237a28dd6f
Add pac build script flags to readme

Suggestions needed
i think its needed for more builders who use our source

Change-Id: Ic3426abbe8b101f14052b10e47a74014bed321a7
Merge remote-tracking branch 'pac/pac-4.4' into pac-4.4