drivers/aspeed/ast2050: Get rid of device_t

Use of device_t has been abandoned in ramstage.

Change-Id: I31f53f5f0e3f1fd6bd9bdbb47ea67c12b3840850
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26070
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
1 file changed