dt-bindings: can: renesas,rcar-canfd: Make interrupt-names required

The Renesas R-Car CAN FD Controller always uses two or more interrupts.
Make the interrupt-names properties a required property, to make it
easier to identify the individual interrupts.

Update the example accordingly.

Link: https://lore.kernel.org/all/a68e65955e0df4db60233d468f348203c2e7b940.1651512451.git.geert+renesas@glider.beSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml

@@ -88,6 +88,7 @@ required:
   - compatible
   - reg
   - interrupts
+  - interrupt-names
   - clocks
   - clock-names
   - power-domains
@@ -136,7 +137,6 @@ then:
         - const: rstc_n
 
   required:
-    - interrupt-names
     - reset-names
 else:
   properties:
@@ -167,6 +167,7 @@ examples:
             reg = <0xe66c0000 0x8000>;
             interrupts = <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>,
                          <GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "ch_int", "g_int";
             clocks = <&cpg CPG_MOD 914>,
                      <&cpg CPG_CORE R8A7795_CLK_CANFD>,
                      <&can_clk>;