msm: camera: Refactor ISP snapshot buffer management

During burst mode, when ISP need to capture one burst image.
Only one buffer is allocated. Both ping pong buffer
should be configured to the same address.
Change the buffer management code flow to fetch new buffer
when there are free buffers avaliable.

Change-Id: I5b7c19e1986bd670904fa326943699a89f00d4b8
Signed-off-by: Kevin Chan <ktchan@codeaurora.org>
2 files changed