CS: Use relaxed initial connection interval for channel sounding devices

Channel Sounding was develope with default initial connection interval (30ms / 50ms). The newly introduced Initial Connection Parameter Optimization feature dynamically adjusts this interval, employing an Aggressive mode (10ms/20ms) for rapid initial connection, followed by a return to the Relaxed mode (30ms/50ms).
Since the Channel Sounding procedure interval is dependent on the connection interval, frequent updates cause the Controller to repeatedly reschedule the procedure, increasing latency and impacting accuracy. This patch addresses the issue by using the default initial connection interval when connecting to a Channel Sounding device.

Flag: com.android.bluetooth.flags.channel_sounding_in_stack
Bug: 324185011
Bug: 396422359
Test: m com.android.btservice
Change-Id: Ib8cc44ad62b1f7fba54042db7c356e0540136e96