Add dont_send_hci_disconnect_repeatedly flag

This is to prevent us from sending multiple HCI disconnect command of
the same device to the BT controller.
Refer to the corresponding CL: aosp/3334294

Bug: 381175628
Bug: 315241296
Test: m -j
Flag: com.android.bluetooth.flags.dont_send_hci_disconnect_repeatedly
Change-Id: I44d6ef900680125da3fdbb0210bb1566a09f9426