side-switch: request bmc reboot to switch to new image

The final piece is to issue a BMC reboot so the system can get over to
the image with the highest priority.

Tested:
- Set running firmware priority to 1 and ran the application. Side
  switch detection ran and BMC was rebooted. After the reboot, the
  system automatically powered on and running image was priority 0.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: Iaafea49f75ad7dd959d4c71a4de29e763f593a83
2 files changed