gpio: Update for new sequence numbers

Use the dev_seq() sequence number in all cases.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/gpio/mxc_gpio.c b/drivers/gpio/mxc_gpio.c
index 29d1bc3..9fc217a 100644
--- a/drivers/gpio/mxc_gpio.c
+++ b/drivers/gpio/mxc_gpio.c
@@ -318,7 +318,7 @@
 
 		plat->regs = (struct gpio_regs *)addr;
 	}
-	plat->bank_index = dev->req_seq;
+	plat->bank_index = dev_seq(dev);
 
 	return 0;
 }