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/zynq_z_turn_defconfig b/configs/zynq_z_turn_defconfig
index 3684b85..d21a8fa 100644
--- a/configs/zynq_z_turn_defconfig
+++ b/configs/zynq_z_turn_defconfig
@@ -52,8 +52,8 @@
 CONFIG_USB_ULPI=y
 CONFIG_USB_STORAGE=y
 CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_MANUFACTURER="Xilinx"
+CONFIG_USB_GADGET_VENDOR_NUM=0x03FD
+CONFIG_USB_GADGET_PRODUCT_NUM=0x0300
 CONFIG_CI_UDC=y
 CONFIG_USB_GADGET_DOWNLOAD=y
-CONFIG_G_DNL_MANUFACTURER="Xilinx"
-CONFIG_G_DNL_VENDOR_NUM=0x03FD
-CONFIG_G_DNL_PRODUCT_NUM=0x0300