usb: gadget: usb_ether: Move settings to common

The usb_ether gadget duplicates the USB settings for the manufacturer,
product ID and vendor ID.

Make sure we use the common option so that we can expect a single VID/PID
couple for a single device.

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/sama5d2_ptc_spiflash_defconfig b/configs/sama5d2_ptc_spiflash_defconfig
index 3cb9b36..6574448 100644
--- a/configs/sama5d2_ptc_spiflash_defconfig
+++ b/configs/sama5d2_ptc_spiflash_defconfig
@@ -30,5 +30,6 @@
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_STORAGE=y
 CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_MANUFACTURER="Atmel SAMA5D2_PTC"
 CONFIG_USB_GADGET_ATMEL_USBA=y
 CONFIG_USB_ETHER=y