Add command line option(s) to chose text format.

Added command line options to header-abi-dumper and header-abi-diff to
support multiple text formats.

Bug: 63865902

Test: BOARD_VNDK_VERSION=current mm -j64 in
      frameworks/compile/libbcc/bcinfo produces libbcinfo.so.lsdump
      successfully.

Test: tests/test.py; all tests pass.

Change-Id: I291d3af16e90b12ee131bb864f90a5b96189db13