Do not update the previously connected devices for the sub device

As bluetooth turn on, and device reboot, UI will show the sub device
entry for hearing aid device or csip device. Check if the device is a sub device, do not update the cachedDevice information.

Bug: 150670922
Bug: 178981521
Test: bonded with a coordinated set. Check the UI only have one entry as Bluetooth turn on and device reboot.
Change-Id: I03dfdc25b57e614194fb8de2c9265edd50760d30