mainboard/iei/pm-lx2-800-r10: transition away from device_t

Replace the use of the old device_t definition inside
mainboard/iei/pm-lx2-800-r10.

Change-Id: I60e5b84141aa4998427c3ecaadf8fce1654b8210
Signed-off-by: Antonello Dettori <dev@dettori.io>
Reviewed-on: https://review.coreboot.org/17295
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed