dt-bindings: slimbus: restrict node name suffixes

Make the pattern matching node names a bit stricter to improve DTS
consistency.  The pattern is restricted to:
1. Only one unit address or one -N suffix,
2. -N suffixes to decimal numbers.
Suggested-by: Rob Herring <robh@kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230530144851.92059-5-krzysztof.kozlowski@linaro.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/slimbus/slimbus.yaml

@@ -15,7 +15,7 @@ description:
 
 properties:
   $nodename:
-    pattern: "^slim(@.*|-[0-9a-f])*$"
+    pattern: "^slim(@.*|-([0-9]|[1-9][0-9]+))?$"
 
   "#address-cells":
     const: 2