dt-bindings: mmc: sdhci-pxa: Add minItems to pinctrl-names

Some older boards only require a default pinctrl. Add a minItems
property so these don't cause dt-validate warnings.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202509030625.PBgLIAwG-lkp@intel.com/
Signed-off-by: Duje Mihanović <duje@dujemihanovic.xyz>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: LegoLivesMatter

Documentation/devicetree/bindings/mmc/sdhci-pxa.yaml

@@ -44,6 +44,7 @@ allOf:
           items:
             - const: default
             - const: state_cmd_gpio
+          minItems: 1
 
         pinctrl-1:
           description:
@@ -61,6 +62,7 @@ allOf:
           items:
             - const: default
             - const: state_uhs
+          minItems: 1
 
         pinctrl-1:
           description: