mb/google: Get rid of device_t

Use of device_t has been abandoned in ramstage.

Change-Id: I8e549e4222ae2ed6b9c46f81c5b5253e8b227ee8
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26086
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/mainboard/google/gru/mainboard.c b/src/mainboard/google/gru/mainboard.c
index c9f3c48..41307c7 100644
--- a/src/mainboard/google/gru/mainboard.c
+++ b/src/mainboard/google/gru/mainboard.c
@@ -333,7 +333,7 @@
 		usb_power_cycle(port);
 }
 
-static void mainboard_init(device_t dev)
+static void mainboard_init(struct device *dev)
 {
 	configure_sdmmc();
 	configure_emmc();
@@ -689,7 +689,7 @@
 	}
 }
 
-static void mainboard_enable(device_t dev)
+static void mainboard_enable(struct device *dev)
 {
 	dev->ops->init = &mainboard_init;
 }