soc/marvell/mvmap2315: Get rid of device_t

Use of device_t has been abandoned in ramstage.

Change-Id: I6db25850d46ea3a940ea2a6f263303d4b5304cb3
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26539
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed