soc/intel/quark: Get rid of device_t

Use of device_t has been abandoned in ramstage.

Change-Id: I102c9b9b1066064589149388d5ebbcd6d0d81fa7
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26542
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/soc/intel/quark/ehci.c

@@ -107,7 +107,7 @@ static const struct reg_script usb_device_port_init_script[] = {
 	REG_SCRIPT_END
 };
 
-static void init(device_t dev)
+static void init(struct device *dev)
 {
 	if ((dev->path.pci.devfn & 7) == EHCI_FUNC) {
 		printk(BIOS_INFO, "Initializing USB PLLs\n");