usb: gadget: Make g_dnl USB settings common

The g_dnl USB settings for the vendor ID, product ID and manufacturer are
actually common settings that can and should be shared by all the gadgets.

Make them common by renaming them, and convert all the users.

Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/configs/apalis_imx6_nospl_it_defconfig b/configs/apalis_imx6_nospl_it_defconfig
index 0ad7674..4fd356f 100644
--- a/configs/apalis_imx6_nospl_it_defconfig
+++ b/configs/apalis_imx6_nospl_it_defconfig
@@ -44,11 +44,11 @@
 CONFIG_USB_STORAGE=y
 CONFIG_USB_KEYBOARD=y
 CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_MANUFACTURER="Toradex"
+CONFIG_USB_GADGET_VENDOR_NUM=0x1b67
+CONFIG_USB_GADGET_PRODUCT_NUM=0x4020
 CONFIG_CI_UDC=y
 CONFIG_USB_GADGET_DOWNLOAD=y
-CONFIG_G_DNL_MANUFACTURER="Toradex"
-CONFIG_G_DNL_VENDOR_NUM=0x1b67
-CONFIG_G_DNL_PRODUCT_NUM=0x4020
 CONFIG_USB_HOST_ETHER=y
 CONFIG_FAT_WRITE=y
 CONFIG_OF_LIBFDT=y