Add new oem command to set accel power mode

Signed-off-by: Gaurav Gandhi <gauravgandhi@google.com>
Change-Id: Ie0b47477b7ae9e8ae206ac0645571a7a79dbda40

Add IPMI interface for CustomAccel service

Change-Id: I28a8976e382b457233ac521e9ab71f75abe029d1
Signed-off-by: Steve Foreman <foremans@google.com>