[Purpose of this Feature/Patch]

fix an issue that speaker volume suddenly increase after connected to a BT headset success

From hci log,we can see the GET_REPORT cmd not be send, and trace stack,
discovery the function bta_hh_co_get_rpt_rsp have a issue:  when
p_dev->get_rpt_snt--, if  p_dev->get_rpt_snt value is 0, It will become
to 255.

[Buganizer]
b/136195302

Change-Id: I4d0131a15720e597ceb3692ffc831e6eb9a6c334