dt-bindings: can: rcar_can: Fix RZ/G2 CAN clocks

According to the latest information, the clock options for CAN on RZ/G2
are the same as the ones available on R-Car Gen3

Fixes: 868b7c0f ("dt-bindings: can: rcar_can: Add r8a774a1 support")
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Chris Paterson <Chris.Paterson2@renesas.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

Documentation/devicetree/bindings/net/can/rcar_can.txt

@@ -27,13 +27,8 @@ Required properties:
 
 - reg: physical base address and size of the R-Car CAN register map.
 - interrupts: interrupt specifier for the sole interrupt.
-- clocks: phandles and clock specifiers for 2 CAN clock inputs for RZ/G2
-	  devices.
-	  phandles and clock specifiers for 3 CAN clock inputs for every other
-	  SoC.
-- clock-names: 2 clock input name strings for RZ/G2: "clkp1", "can_clk".
-	       3 clock input name strings for every other SoC: "clkp1", "clkp2",
-	       "can_clk".
+- clocks: phandles and clock specifiers for 3 CAN clock inputs.
+- clock-names: 3 clock input name strings: "clkp1", "clkp2", and "can_clk".
 - pinctrl-0: pin control group to be used for this controller.
 - pinctrl-names: must be "default".
 
@@ -49,8 +44,7 @@ using the below properties:
 Optional properties:
 - renesas,can-clock-select: R-Car CAN Clock Source Select. Valid values are:
 			    <0x0> (default) : Peripheral clock (clkp1)
-			    <0x1> : Peripheral clock (clkp2) (not supported by
-				    RZ/G2 devices)
+			    <0x1> : Peripheral clock (clkp2)
 			    <0x3> : External input clock
 
 Example