dt-bindings: pinctrl: mediatek: mt7986: fix patternProperties regex

Set second level patternProperties to '^.*mux.*$' and '^.*conf.*$' on
mediatek,mt7986-pinctrl.yaml to be on par with other schemas.
Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230317213011.13656-19-arinc.unal@arinc9.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/mediatek,mt7986-pinctrl.yaml

@@ -72,7 +72,7 @@ patternProperties:
     additionalProperties: false
 
     patternProperties:
-      '.*mux.*':
+      '^.*mux.*$':
         type: object
         additionalProperties: false
         description: |
@@ -256,7 +256,7 @@ patternProperties:
                   items:
                     enum: [wf_2g, wf_5g, wf_dbdc]
                   maxItems: 3
-      '.*conf.*':
+      '^.*conf.*$':
         type: object
         additionalProperties: false
         description: