HidHost: Do not remove bonded device due to unexpected HID connection

New incoming HID connections are not allowed. Such connections should be
rejected and disabled, instead of removing the device. It is possible
that the remote device intiaited HID connection immediately after
pairing while the Android BT stack was still performing service
discovery. In such cases, HidHostService must reject the connection but
not remove the device. After service discovery is completed, PhonePolicy
may ask to connect the HID service.

Test: mmm packages/modules/Bluetooth
Test: Manual | Pair HID device, disable input device toggle, initiate
connection from HID device, connection should be unsuccessful but bond
should be retained
Bug: 331350601
Bug: 320762367

Change-Id: Ie32559468d7b8d70caab5bda37f590f6f3e4a42e