Bluetooth: Ignore too large handle values in BIG

hci_le_big_sync_established_evt is necessary to filter out cases where the
handle value is belonging to ida id range, otherwise ida will be erroneously
released in hci_conn_cleanup.

Fixes: 181a42ed

 ("Bluetooth: Make handle of hci_conn be unique")
Reported-by:  <syzbot+b2545b087a01a7319474@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=b2545b087a01a7319474
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>