dt-bindings: pinctrl: mediatek,mt7622-pinctrl: Add missing base reg

The pin controller for both MT7622 and MT7629 need both a "base"
and an "eint" MMIO like the ones found on other MediaTek SoCs:
while devicetrees have always been correct, the binding is not,
as it only allows an "eint" reg.

Add "base" to reg-names and increment maxItems for reg to two.

Signed-off-by: AngeloGioacchino Del Regno <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Rob Herring (Arm) <[e-mail]>

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

···
       - mediatek,mt7629-pinctrl
 
   reg:
-    maxItems: 1
+    maxItems: 2
 
   reg-names:
     items:
+      - const: base
       - const: eint
 
   gpio-controller: true
···
 
         pio: pinctrl@10211000 {
             compatible = "mediatek,mt7622-pinctrl";
-            reg = <0 0x10211000 0 0x1000>;
+            reg = <0 0x10211000 0 0x1000>,
+                  <0 0x10005000 0 0x1000>;
             gpio-controller;
             #gpio-cells = <2>;