Mikrotik seems to prefer "hEX S" as general name for this model,
therefore include this in devicetree model name as well.
Signed-off-by: Priit Laes <plaes@plaes.org>
Link: https://github.com/openwrt/openwrt/pull/16658
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>