Unify the command line options for create_reference_dumps.py

The options are preceded by double dashes. The single-dash options
continue to be supported for existing documents.

Test: ./create_reference_dumps.py -p aosp_arm64 --release next
      -l libc --lib libm --lib-variant LLNDK
Bug: 323447559
Change-Id: I72c9cd3930fc7303f4d5c73c19032df2fbc00227
2 files changed