libpayload: Drop usb_fatal()

We have fatal(), which is just as good.

Coccinelle script:
  @@
  expression E;
  @@
  -usb_fatal(E)
  +fatal(E)

Change-Id: Iabecbcc7d068cc0f82687bf51d89c2626642cd86
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/395
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
diff --git a/payloads/libpayload/drivers/usb/usbmsc.c b/payloads/libpayload/drivers/usb/usbmsc.c
index 729bf91..f90acb1 100644
--- a/payloads/libpayload/drivers/usb/usbmsc.c
+++ b/payloads/libpayload/drivers/usb/usbmsc.c
@@ -398,7 +398,7 @@
 
 	dev->data = malloc (sizeof (usbmsc_inst_t));
 	if (!dev->data)
-		usb_fatal ("Not enough memory for USB MSC device.\n");
+		fatal("Not enough memory for USB MSC device.\n");
 
 	MSC_INST (dev)->protocol = interface->bInterfaceSubClass;
 	MSC_INST (dev)->bulk_in = 0;