camera: add exposure hack for d2

* d2's hal is reporting unusable exposure values
* use sane values to make shit work

Change-Id: I0d1313db1da56bfec553ef09df601626342ab55e
msm8960-common: simplify isSupported check in cmhw

Change-Id: I5a8797df515138416c56b63fdbb77af3910434be