tegra: seaboard: Correct the gpio_request() call

Requesting a GPIO without a name is not supposed anymore. This causes the
request to fail. Add a name so that the serial console works on seaboard.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reported-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NTom Warren <twarren@nvidia.com>

board/nvidia/seaboard/seaboard.c

@@ -20,7 +20,7 @@
 void gpio_early_init_uart(void)
 {
 	/* Enable UART via GPIO_PI3 (port 8, bit 3) so serial console works */
-	gpio_request(GPIO_PI3, NULL);
+	gpio_request(GPIO_PI3, "uart_en");
 	gpio_direction_output(GPIO_PI3, 0);
 }
 #endif