Merge changes from topics 'cam-ndk-hidden-enum', 'cam-ndk-enum-dco',...

Merge changes from topics 'cam-ndk-hidden-enum', 'cam-ndk-enum-dco', 'cam-ndk-hidden-keys' into nyc-dev

* changes:
  CameraNDK: hide some capabilities in NDK
  CameraNDK: add metadata enum value documents
  CameraNDK: hide more NDK metadata tags