native: add flag to disable legacy sensors fusion

Causes problems on all p31xx devices.
http://pastebin.com/PabjFVWP

Change-Id: Iac9a913e0984d7e9e419772215d3fb3d1a0cb5e8
Merge remote-tracking branch 'cm/cm-10.1' into cm-10.1
hwcomposer: Disable strict aliasing

Change-Id: Ibcb066e16db7a75c2467f35cd8436b510b9ddacb

Conflicts:

	services/surfaceflinger/Android.mk