Allow cargo2android.py to use a config file instead of command-line options. am: 0fbdafe016 am: 6c63da7a86 am: c5c74033f2

Original change: https://android-review.googlesource.com/c/platform/development/+/1686813

Change-Id: I4e8f9a8bd7c3662cbfe7ab6f99bfe852e16f7119