Camera: Fix for ZSL/Burst mode JPEG memory leak

This change fixes the memory leaks
during ZSL/Burst mode in the omx
layer.

Change-Id: Ia6c557c7db9572cc3e6c4dabddb65c5a0bf6d189
CRs-fixed: 349015
(cherry picked from commit 17c0940805dcc3ba5840eada8a3a026c0d501136)