Update TypeConverter#ParseFormats to handle DEFAULT format

AUDIO_FORMAT_DEFAULT can now be parsed from a string,
however it's not a 'valid' format. Update TypeConverter
unit test to handle that.

Bug: 142480271
Test: atest libmedia_helper_tests
Change-Id: I738b08110b45eb72b3edd4af1a61bf89c26d193a
1 file changed