This updates the documentation of all the Gardena boards to use
the new `zephyr:board::` directive.
Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
This adds support for the SiM3U/Si4467 based SoM used on the GARDENA
smart Gateway [1] (art. no 19000 and 19005).
[1] https://github.com/husqvarnagroup/smart-garden-gateway-public
Signed-off-by: Michael Zimmermann <michael.zimmermann@grandcentrix.net>