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/drivers/Makefile b/drivers/Makefile
index 8c53e05..4105864 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -47,9 +47,9 @@
 obj-$(CONFIG_SPL_ETH_SUPPORT) += net/phy/
 obj-$(CONFIG_SPL_USB_ETHER) += net/phy/
 obj-$(CONFIG_SPL_MUSB_NEW_SUPPORT) += usb/musb-new/
-obj-$(CONFIG_SPL_USB_GADGET_SUPPORT) += usb/gadget/
-obj-$(CONFIG_SPL_USB_GADGET_SUPPORT) += usb/common/
-obj-$(CONFIG_SPL_USB_GADGET_SUPPORT) += usb/gadget/udc/
+obj-$(CONFIG_SPL_USB_GADGET) += usb/gadget/
+obj-$(CONFIG_SPL_USB_GADGET) += usb/common/
+obj-$(CONFIG_SPL_USB_GADGET) += usb/gadget/udc/
 obj-$(CONFIG_SPL_DFU_SUPPORT) += dfu/
 obj-$(CONFIG_SPL_WATCHDOG_SUPPORT) += watchdog/
 obj-$(CONFIG_SPL_USB_HOST_SUPPORT) += usb/host/