dynamic_sensor: Notify multi-HAL 2.1 of connected sensors.

Bug: 195964858
Test: Paired a Sony PS4 controller and verified it is present in sensor
 list as an accelerometer. It can't be sampled, but the LSM6DSR
 accelerometer may still be sampled.
Change-Id: I182291cebdf84e5f6cd44d16debd6a07c4bc5281
3 files changed