Floss: Reverse endianness of parsed adv data

Uuids from LE scan advertised data packet are reversed endianness
from how btif parses Uuids.

Bug: 249526789
Tag: #floss
Test: Unit tests and manually checking format of UUIDs parsed
Change-Id: Ib14570645f057ab950017b6a34fa1a5c139e54f2