wifi: Add RTT API wrappers in WifiLegacyHal

These are just wrapper methods over the legacy RTT related HAL API's.
Note: Some of the RTT related API's have been intentionally left off
because they're no longer used.

Bug: 31991232
Test: Compiles
Change-Id: Ied19d9ec1d4347ead0c40ab3683a1a0bae704f90