dt-bindings: ARM: at91: Document SAMA5D27 WLSOM1 and Evaluation Kit

Document device tree binding of SAMA5D27 WLSOM1 - Wireless module;
and SAMA5D27 WLSOM1 EK - Wireless module evaluation kit, from Microchip.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Link: https://lore.kernel.org/r/1573543139-8533-3-git-send-email-eugen.hristev@microchip.com


Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>