grouper: enable various optimizations

32 bit cacheline flag
pld prefetch is supported according to the arm docs
pro-opt dex file because booting takes two days after an update without + overall smoothness is better.
besides who wants to de/recompile apks? we have awesome features and for themeing use a theme engine.

Change-Id: Iacc9632fcaf7479a7f03745a43189cfcb1fc2a8a