dm: gpio: Add live tree support

Add support for requesting GPIOs with a live device tree.

This involves adjusting the function signature for the legacy function
gpio_request_by_name_nodev(), so fix up all callers.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes to stm32f746-disco.c:
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index da9e944..7dc37f0 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -728,9 +728,10 @@
 		debug("%s: Missing/invalid peripheral ID\n", __func__);
 		return -EINVAL;
 	}
-	gpio_request_by_name_nodev(blob, node, "nvidia,vbus-gpio", 0,
-				   &config->vbus_gpio, GPIOD_IS_OUT);
-	gpio_request_by_name_nodev(blob, node, "nvidia,phy-reset-gpio", 0,
+	gpio_request_by_name_nodev(offset_to_ofnode(node), "nvidia,vbus-gpio",
+				   0, &config->vbus_gpio, GPIOD_IS_OUT);
+	gpio_request_by_name_nodev(offset_to_ofnode(node),
+				   "nvidia,phy-reset-gpio", 0,
 				   &config->phy_reset_gpio, GPIOD_IS_OUT);
 	debug("enabled=%d, legacy_mode=%d, utmi=%d, ulpi=%d, periph_id=%d, "
 		"vbus=%d, phy_reset=%d, dr_mode=%d\n",