dt-bindings: watchdog: 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 <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Reviewed-by: Tony Lindgren <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

Documentation/devicetree/bindings/watchdog/watchdog.yaml

···
 select:
   properties:
     $nodename:
-      pattern: "^watchdog(@.*|-[0-9a-f])?$"
+      pattern: "^watchdog(@.*|-([0-9]|[1-9][0-9]+))?$"
 
 properties:
   $nodename:
-    pattern: "^(timer|watchdog)(@.*|-[0-9a-f])?$"
+    pattern: "^(timer|watchdog)(@.*|-([0-9]|[1-9][0-9]+))?$"
 
   timeout-sec:
     description: