Expose the Radio HAL Version for Test Purposes

To properly check that values are being populated by
devices supporting newer HALs, it is necessary to
avoid enforcement on devices using older HAL versions.
Exposing the HAL version for test purposes allows that.

Bug: 122834594
Test: compilation
Change-Id: Idadc2fc8dd4f7b4765af90d92b62eea3e017a843