Fix errors in handling RawAddresses

* In change I8d1bd6914aec55bb53495b1d0d5e3d37b86865e6
  memcmp(a, b, LEN) != 0 should be translated to
  A != B
* memcpy should not be applied to RawAddress objects.
  Assignment operator should be used instead.
* memset should not be applied to RawAddress objects.
  Assignment to RawAddress::kEmpty should be used.
* Fixed a crash in GATT

Bug: 64316340
Test: Unit test, pair with device and transmit
Change-Id: Iceefab821c1d45a88194d87a43a192afa5f263fd