Revert "Add dumpsys support for LE connection parameter updates"

Reverting for now after talking to Jacky because this causes  circular dependencies as lower layer (stack/) functions are calling higher layer APIs (btif/) directly.

To restore a change like this, the data should be collected at a lower layer in the stack and reported through polling or a callback.

This reverts commit bc2c403c.

Change-Id: I748843864ae7198ea021fe70d2643a62097ab029