ExifInterface: Add PEF, RW2 files parse support

PEF, RW2 files have unique ways of storing their data. This CL adds code
that checks whether a file is one of these formats and parses the data
according to specifications.

Bug: 29409358
Change-Id: I6c368b4865414062f9f535bf180d7d7bf6984a7d
4 files changed