dt-bindings: mfd: qcom,spmi-pmic: Fix regulator node schema

The regulators node of Qualcomm SPMI PMIC represents sub-device, so it
has its own compatible, multiple regulators and uses dedicated bindings.

Fixes: 3f5117be ("dt-bindings: mfd: convert to yaml Qualcomm SPMI PMIC")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20220828084341.112146-14-krzysztof.kozlowski@linaro.org

Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.yaml

@@ -94,7 +94,7 @@ properties:
 
   regulators:
     type: object
-    $ref: /schemas/regulator/regulator.yaml#
+    $ref: /schemas/regulator/qcom,spmi-regulator.yaml#
 
 patternProperties:
   "^adc@[0-9a-f]+$":