RemoteDevice: Fix for race condition on adding device properties

There could be a case where addDeviceProperties is called multiple times
for the same device which leads to situation of having more than one
DeviceProperties for single device.
This could lead to undefined behavior when reading properties e.g. bond
state etc.

It can happen on Bluetooth startup when there is many bonded devices.
Bug: 374909756
Bug: 375158716
Test: atest RemoteDevicesTest
Flag: com.android.bluetooth.flags.fix_add_device_properties

Change-Id: I6292bbe3f68794b0b79f21f2f37e584fbceaec3a