staging: greybus: firmware: Change long long unsigned to unsigned long long

Fixes checkpatch warning:
  type 'long long unsigned int' should be specified
  in [[un]signed] [short|int|long|long long] order
Signed-off-by: Michael Sartain <mikesart@fastmail.com>
Acked-by: Viresh Kumar <viresh.kumar at linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/Documentation/firmware/authenticate.c

@@ -103,7 +103,7 @@ int main(int argc, char *argv[])
 		goto close_fd;
 	}
 
-	printf("UID received: 0x%llx\n", *(long long unsigned int *)(uid.uid));
+	printf("UID received: 0x%llx\n", *(unsigned long long int *)(uid.uid));
 
 	/* Get certificate */
 	printf("Get IMS certificate\n");