Fix bit inversion in RFCOMM event handler.

The bit-flip seems to have broken the authentication sequence
for incoming RFCOMM connections.

Bug: 268273571
Test: Manual (see comment#1 in bug)
Ignore-AOSP-First: This branch is unreachable from AOSP.
Pending-CP-To-Master: ag/22446590
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:23e155d25cf425a319fff2049a3e932fd266cc98)
Merged-In: I52b4c2f8d595e3d7be3fb18818f8b7f93271fb32
Change-Id: I52b4c2f8d595e3d7be3fb18818f8b7f93271fb32