Add NETGEAR_BOARD_ID and NETGEAR_HW_ID to DEVICE_VARS as multiple devices
set them in their recipes, so without them being added to DEVICE_VARS then
simply the value from last recipe that gets evaluated is used and images
are generated with the wrong ID-s.
Link: https://github.com/openwrt/openwrt/pull/17203
Signed-off-by: Robert Marko <robimarko@gmail.com>
(cherry picked from commit 1b6f7ec6794233fbf7c1cf17dcee34053c08fa9c)
863d1a634e