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We have to pause BLE scan before setting scan parameters. This CL
will make the API easier to use.

Bug: internal b/140961065
Test: Build and run, check HCI logs
Change-Id: Ia63b392ab09505d3d284d150d71b07d134d8a4e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850801Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Tiansong Cui <tiansong@google.com>
Auto-Submit: Tiansong Cui <tiansong@google.com>
Cr-Commit-Position: refs/heads/master@{#704464}