Add support to dump LensShadingMap metadata, related cleanup

- Add custom toString() for LensShadingMap to workaround
  b/16899576.
- Remove several now-unneeded custom toString() methods,
  since lmp-release provides them in:
  frameworks/base/core/java/android/hardware/camera2/params/
- Picky formatting fix.

Bug: 16899576
Change-Id: Iebf0b03ea27f291bc0f633b3760d5bd696df906d
1 file changed