sdm: Add GetBufferInfo Interface

- New interface helps in getting aligned w/h size in SDM.
- Implement the interface in HWC Buffer Allocator.
- Pass BufferAllocator Intf to CompMgr and Strategy

Change-Id: I1917143379aa2c706ea6babc0d7747d9cf0911bb
Crs-fixed: 1104632
8 files changed