dt-bindings: arm: realtek: Add RTD1395 and Banana Pi BPI-M4

Define compatible strings for Realtek RTD1395 SoC and BPI-M4 SBC.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Andreas Färber <afaerber@suse.de>

Documentation/devicetree/bindings/arm/realtek.yaml

@@ -40,4 +40,10 @@ properties:
           - enum:
               - synology,ds418 # Synology DiskStation DS418
           - const: realtek,rtd1296
+
+      # RTD1395 SoC based boards
+      - items:
+          - enum:
+              - bananapi,bpi-m4 # Banana Pi BPI-M4
+          - const: realtek,rtd1395
 ...