camera: Fix continuous focus for HDR

 * This patch makes HDR mode suck quite a lot, and doesn't appear to be
   necessary any longer according to the examples given.

 * Reverts this change: http://review.cyanogenmod.org/#/c/45730/1

Change-Id: Ib378a0ba91617ba7ec5d72473d1fce384cf1cce7
Merge branch 'cm-10.2' into martincz