Revert "Remove HDR until exposure is fixed"

This reverts commit 716aeb73dd0e39d2c6d87e6755f7d06b9660848d

Change-Id: Ife5411394e7dff81d0d55c288ec2a97ae5d4f029
Merge "Revert "Remove HDR until exposure is fixed"" into jb4.2