floss: Reset BT controller on HW error event

This patche restarts Floss daemon upon receiving a HW error event
from the BT controller. During the restart, it will send an
HW reset command to clear the error state of the BT controller.

Bug: 316275783
Tag: #floss
Test: mmm packages/modules/Bluetooth
Test: manual test with `hcitool cmd 3f 4e`
Flag: EXEMPT, floss only change

Change-Id: I137bc8017c9afacffd16d9e98f5ef32a74663953