sdm: gralloc: Add support for Secure Camera use-case

1. Add support for Secure Camera use-case in SDM and gralloc.
2. Set the appropriate ION Heap ID, secure camera/preview ION flags
   and the alignment requirement for Secure Camera use-case.

CRs-Fixed: 1065934
Change-Id: I9e80f3093d598eec7bf717ddd0e3adbbc3382d5e
12 files changed