hotspot2: ANQP elements cleanup Part 1

Cleanup and add unit tests for the following ANQP elements (and
the underlying classes used by those elements):
- HSFriendNameElement
- IPAddressTypeAvailabilityElement
- RoamingConsortiumElement
- VenueNameElement

The cleanup included using a static #parse function for parsing
raw bytes into an element object, the new ByteBufferReader APIs
for reading integer and string from ByteBuffer, and documented
possible runtime exceptions.

Additional changes include:
- remove the unnecessary setting of byte order for
the ByteBuffer, since we're not using the ByteBuffer's APIs
for reading integer values (all reads are either byte or byte
array).
- remove the unused functions in ANQPFactory

More ANQP elements cleanup will be done in the upcoming CLs.

Bug: 33000864
Test: frameworks/opt/net/wifi/tests/wifitests/runtests.sh
Change-Id: I6da918c83722d5c0ca7a2374ff5fa5f630cdea6d

0 files changed, 0 insertions, 0 deletions