dt-bindings: i2c: renesas,i2c: Drop "renesas,i2c-rcar"

The compatible value "renesas,i2c-rcar" was deprecated in commit
ad4a8dc3 ("i2c: rcar: Add per-Generation fallback bindings"),
and never had any users in upstream Linux.  Drop its description from
the DT bindings.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

Documentation/devicetree/bindings/i2c/renesas,i2c.txt

@@ -32,7 +32,6 @@ Required properties:
 				device.
 	"renesas,rcar-gen3-i2c" for a generic R-Car Gen3 or RZ/G2 compatible
 				device.
-	"renesas,i2c-rcar" (deprecated)
 
 	When compatible with the generic version, nodes must list the
 	SoC-specific version corresponding to the platform first followed