msm8974: initial camera bringup

* enable zsl overlay
* kang camera wrapper from m7

Change-Id: I66f54a007c468260f97974f01a9534d3e7f5221f
msm8974: s/adreno200/adreno330/

Change-Id: I1a33edba6db9075222739463a0b1c16913d0cdaf