dt-bindings: pinctrl: mediatek: mt7622: add "antsel" function

MT7622 pinctrl has ANTSEL* pins. Linux support for those was added in
the commit 19f599e83ac5 ("pinctrl: mediatek: mt7622: add antsel
pins/groups"). Include them in binding.

Cc: Chuanhong Guo <[e-mail]>
Signed-off-by: Rafał Miłecki <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Message-ID: <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

Documentation/devicetree/bindings/pinctrl/mediatek,mt7622-pinctrl.yaml

···
           function:
             description:
               A string containing the name of the function to mux to the group.
-            enum: [emmc, eth, i2c, i2s, ir, led, flash, pcie, pmic, pwm, sd,
-                   spi, tdm, uart, watchdog, wifi]
+            enum: [antsel, emmc, eth, i2c, i2s, ir, led, flash, pcie, pmic, pwm,
+                   sd, spi, tdm, uart, watchdog, wifi]
 
           groups:
             description:
···
           - function
 
         allOf:
+          - if:
+              properties:
+                function:
+                  const: antsel
+            then:
+              properties:
+                groups:
+                  items:
+                    enum: [antsel0, antsel1, antsel2, antsel3, antsel4, antsel5,
+                           antsel6, antsel7, antsel8, antsel9, antsel10,
+                           antsel11, antsel12, antsel13, antsel14, antsel15,
+                           antsel16, antsel17, antsel18, antsel19, antsel20,
+                           antsel21, antsel22, antsel23, antsel24, antsel25,
+                           antsel26, antsel27, antsel28, antsel29]
           - if:
               properties:
                 function: