HID: Fix the behavior of virtual_cable_unplug

The Bluetooth HID profile itself should not unbond other device; the
Bluetooth HID host and device should only disconnect the HID profile
when sending or receiving virtual_cable_unplug command.

Bug: 67866553
Test: Test with SL4A.
Change-Id: Ie378a7292309d2b11f53fcd82bca1cf42e64b0c0