Note that this is a big security hole and should be removed after we
complete the EC autoupdate mechanism and vboot code.
To full update EC firmware on proto 1.0, we need a manual way to switch
EC running on RO/RW. This CL implements the LPC command.
BUG=chrome-os-partner:8415
TEST=on proto 0.5.
ectool reboot_ec RW_A # EC boots to RW A
ectool reboot_ec RO # EC boots to RO
Change-Id: Ibf050328bc4e3d2c6d72bfc478d6334f11f0eb46