SnapdragonCamera: Init optimization and concurrency fixes

1. Frameprocessor init call to be in parallel.
2. Fix concurrency issue on filters with background
saving feature.
3. Various other capture module concurrency issue fixes.

Change-Id: Icce713b0d6e4ea1c15bbe9ac2cfb3977b0a9c1d7
CRs-Fixed: 1067848
5 files changed