dt-bindings: mmc: renesas,sdhi: Fix dtbs-check warning

Fix dtbs-check warning pinctrl-names:0:'default' was expected
for r8a77470-iwg23s-sbc.dts file.
Signed-off-by: NBiju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: NLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210817090313.31858-2-biju.das.jz@bp.renesas.comSigned-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml

@@ -9,9 +9,6 @@ title: Renesas SDHI SD/MMC controller
 maintainers:
   - Wolfram Sang <wsa+renesas@sang-engineering.com>
 
-allOf:
-  - $ref: "mmc-controller.yaml"
-
 properties:
   compatible:
     oneOf:
@@ -104,29 +101,39 @@ properties:
   pinctrl-1:
     maxItems: 1
 
+  pinctrl-names: true
+
+  max-frequency: true
+
+allOf:
+  - $ref: "mmc-controller.yaml"
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,sdhi-mmc-r8a77470
+    then:
+      properties:
+        pinctrl-names:
+          items:
+            - const: state_uhs
+    else:
+      properties:
         pinctrl-names:
           minItems: 1
           items:
             - const: default
             - const: state_uhs
 
-  max-frequency: true
-
-required:
-  - compatible
-  - reg
-  - interrupts
-  - clocks
-  - power-domains
-
-if:
+  - if:
       properties:
         compatible:
           contains:
             enum:
               - renesas,sdhi-r7s72100
               - renesas,sdhi-r7s9210
-then:
+    then:
       required:
         - clock-names
       description:
@@ -134,6 +141,13 @@ then:
         sectioned off to be run by a separate second clock source to allow
         the main core clock to be turned off to save power.
 
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - power-domains
+
 unevaluatedProperties: false
 
 examples: