Bluetooth: add system property for HID transport selection am: d1f56c65d1

Original change: https://android-review.googlesource.com/c/platform/system/libsysprop/+/2833239

Change-Id: I7ebed74a4e6e91c013249d7a172e9a466010870d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>