Allow multiple connections on MAP profile.

Bug: 68750354
Test: tested manually. 2 Phones paired on MAP profile. Auto received
messages from both phones and displayed notifications. Checked the state
with "adb shell dumpsys bluetooth_manager" - shows 2 phones connected
on MAP

internal change-id: I7ab75160a339eb9fe73f840f8df616ed9ca78208

Change-Id: I3b3e5518e869bdd8c4778f1031009decb3765eec