Kconfig: rename CONFIG_SPL_USB_GADGET_SUPPORT as CONFIG_SPL_USB_GADGET

The SPL option for USB gadget should be named after the option for u-boot
(CONFIG_USB_GADGET)

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
diff --git a/arch/arm/mach-imx/spl.c b/arch/arm/mach-imx/spl.c
index 58a9227..397d6d4 100644
--- a/arch/arm/mach-imx/spl.c
+++ b/arch/arm/mach-imx/spl.c
@@ -154,7 +154,7 @@
 }
 #endif /* CONFIG_MX7 || CONFIG_IMX8M */
 
-#ifdef CONFIG_SPL_USB_GADGET_SUPPORT
+#ifdef CONFIG_SPL_USB_GADGET
 int g_dnl_bind_fixup(struct usb_device_descriptor *dev, const char *name)
 {
 	put_unaligned(CONFIG_USB_GADGET_PRODUCT_NUM + 0xfff, &dev->idProduct);