Remove serialize_hogp_and_dis flag

Also remove the TODO to implement multiservice HoGP since there are
more interop cases which requires us to distinguish the peripherals
before discovering HoGP services, e.g. INTEROP_HOGP_LONG_REPORT.

Bug: 367910199
Test: m -j
Flag: EXEMPT, flag removal
Change-Id: Id0fd9d5a328b1e97a6733308cfdf5fe50c0db6ff