meta-romulus: Add AVSBus and VRM workarounds

Add AVSBus and VRM control scripts.
Add systemd services to do AVSBus workaround, disable AVSBus, do VRM workaround and enable
AVSBus.
Add BitBake recipe to install script and services.

Change-Id: I72ec0138d23eba57ee56d5a6b01e3cd638c819bc
Signed-off-by: Lei YU <mine260309@gmail.com>
10 files changed