Clear alias name when device unbond

Clear alias name when device is unpaired to prevent settings app get old
alias name when scan new device.

Bug: 135944797
Test: manual
Change-Id: I8d1a50e0823f9ce312f203859e906fcece838db1
Merged-In: I8d1a50e0823f9ce312f203859e906fcece838db1
diff --git a/src/com/android/bluetooth/btservice/RemoteDevices.java b/src/com/android/bluetooth/btservice/RemoteDevices.java
index 46e28a5..2965715 100644
--- a/src/com/android/bluetooth/btservice/RemoteDevices.java
+++ b/src/com/android/bluetooth/btservice/RemoteDevices.java
@@ -320,6 +320,7 @@
                     without waiting for the ACTION_UUID intent.
                     This was resulting in multiple calls to connect().*/
                     mUuids = null;
+                    mAlias = null;
                 }
             }
         }