Bluetooth: GATT: Fix missing connection address comparison

When receiving notifications we should be properly matching against
the remote address of subscribed peers.

Change-Id: Ibcba1101aac418fd02f9068667f84e8294aade07
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
(cherry picked from commit 883f91a7c7c534d812c7d5c2a1d340e0dab2b58a)