edison: Disable CONFIG_USB_HOST_ETHER

This board does dwc3 gadget, not host, so we cannot have host support or
we will fail to link.

Signed-off-by: Tom Rini <trini@konsulko.com>

configs/edison_defconfig

@@ -36,5 +36,6 @@ CONFIG_USB_GADGET_DOWNLOAD=y
 CONFIG_G_DNL_MANUFACTURER="Intel"
 CONFIG_G_DNL_VENDOR_NUM=0x8087
 CONFIG_G_DNL_PRODUCT_NUM=0x0a99
+# CONFIG_USB_HOST_ETHER is not set
 CONFIG_FAT_WRITE=y
 CONFIG_SHA1=y