floss: Fix advertising parameters disallow issue

Bluetooth controllers might not allow advertising set parameters
change while it's being advertised. This patch disable the
an active advertising set before changing its parameters, and then
re-enable it.

Bug: 233128828
Tag: #floss
Test: build.py --target test
Test: manaul test on volteer with btclient and btmon
Change-Id: I331714c56a97c6e5f07756d3aeb055cd8ec5b52b