Add empty defaults for bt name and device class am: 43baa985 am: ebf7e6ef...

Add empty defaults for bt name and device class am: 43baa985 am: ebf7e6ef am: dd10a216 am: 530dea47

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/1973772

Change-Id: I06e3d46538c8cdb8c57c281e443ebd7c831be8f4