Include gatt disconnect reason in BT dumpsys

Summary: BT dumpsys always logs reason 0 in case of gatt disconnect, add the reason.

Bug: 361326075
Flag: EXEMPT, logging change

Test: m Bluetooth, Observed the bt dumpsys after bel connect/disconnect

Change-Id: Icf05b0b74c538ee2bbe156c4458aaadc7cda5adf
Signed-off-by: Abdelrahman Daim <adaim@meta.com>