ESR11-E7716: Disable scans while setting local RPA

This change is required to disable any ongoing classic
advertisement or any scan before setting the RPA for the
DUT, and reenable them after the Set RPA command.
If a direct connection is ongoing, the RPA is not set.
A background connection is suspended and resumed for
sending the "Set RPA" HCI command.

This patch is based on CAF patch by niarora@codeaurora.org
690c2db21f650f74c202fd380cca4ca74cbdf83c

Test: manual
Bug: 35935853
Change-Id: Ifbc90d0c52c8f1fa627ac80c20a69149e89cb794