Add function to update LE connection parameters

As part of new SL4A tests for LE CoC to measure data throughput
performance, this commit will add a function to enable the CoC Facade
to modify the LE Connection Parameters especially the Connection
Intervals.

Test: Ran the new ACTS Tests for LE CoC
Bug: 70683224
Change-Id: Ie071b09a44d68fe063198a39eb788c434b092442