dt-bindings: arm: amlogic: add Banana PI M5 bindings

Add bindings for the Banana PI M5 board.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210514143255.3352774-3-narmstrong@baylibre.com

Documentation/devicetree/bindings/arm/amlogic.yaml

@@ -167,6 +167,7 @@ properties:
       - description: Boards with the Amlogic Meson SM1 S905X3/D3/Y3 SoC
         items:
           - enum:
+              - bananapi,bpi-m5
               - hardkernel,odroid-c4
               - hardkernel,odroid-hc4
               - khadas,vim3l