dt-bindings: arm: amlogic: Add the Endless Mobile Endless Mini (EC-100)

Add bindings documentation for the Endless Mini (EC-100) from Endless
Mobile.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Documentation/devicetree/bindings/arm/amlogic.txt

@@ -63,6 +63,7 @@ Board compatible values (alphabetically, grouped by SoC):
 
   - "minix,neo-x8" (Meson8)
 
+  - "endless,ec100" (Meson8b)
   - "hardkernel,odroid-c1" (Meson8b)
   - "tronfy,mxq" (Meson8b)