Revert "Revert "Client side implementation for IRadioConfig hal.""

This reverts commit d1b957a4.

Reason for revert: Trying to re-land the reverted change.

Test: Basic telephony sanity (new APIs are not exercised yet)
Bug: 64131518
Merged-in: I1f19df6798573c86da105ab512effed80526c092
Change-Id: I1f19df6798573c86da105ab512effed80526c092