Refactored libcameraservice_depth_processor_fuzzer

The following are the updates to the fuzzer:
1. Updated the FDP consumption and the population of
   the DepthPhotoInputFrame struct.
2. Code Coverage improved from 1.37% to 85.75%.

Test: ./libcameraservice_depth_processor_fuzzer
exec/s: 325
Bug: 349020300

Change-Id: Ibaf66c27b6c0a1ceb1cad72019da4443034778f5