Disable ubsan diagnostics under HWASan.

This is a workaround for a compiler bug that makes this combination
extremely slow to build.

Bug: 191808836
Test: m net_test_btm_iso with SANITIZE_TARGET=hwaddress
Merged-In: Ide7436bbc564413cb2f29355ada5286976607205
Change-Id: Ide7436bbc564413cb2f29355ada5286976607205
(cherry picked from commit b15a5648)