Add tags to lsdump_paths.txt

- Update the conversion from LSDUMP_PATHS to lsdump_paths.txt.
  LSDUMP_PATHS is a list of "tag:path". Each element is converted to
  "tag: path\n" in lsdump_paths.txt.

- Update the check for redundant ABI dumps.
  prebuilts/abi-dumps/ndk contains the ABI dumps for NDK.
  prebuilts/abi-dumps/vndk contains those for LLNDK, VNDK-core, VNDK-SP,
  except NDK.

Test: make findlsdumps
Bug: 133176785
Change-Id: I90559e6c68a7f901a318cd8d5125e9a7401ac22c