dt-bindings: timestamp: restrict node name suffixes

Make the pattern matching node names a bit stricter to improve DTS
consistency.  The pattern is restricted to -N suffixes to decimal
numbers.

Suggested-by: Rob Herring <[email protected]>
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Tony Lindgren <[email protected]>
Acked-by: Rob Herring <[email protected]>
Acked-by: Uwe Kleine-König <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring <[email protected]>

Author: krzk

Documentation/devicetree/bindings/timestamp/hardware-timestamps-common.yaml

@@ -17,7 +17,7 @@ description:
 
 properties:
   $nodename:
-    pattern: "^timestamp(@.*|-[0-9a-f])?$"
+    pattern: "^timestamp(@.*|-([0-9]|[1-9][0-9]+))?$"
 
   "#timestamp-cells":
     description: