dt-bindings: tpm: Drop type from "resets"

"resets" is a standard property which already has a type. Users only need
to define how many clocks and what each clock is if more than 1 clock.
Reviewed-by: Lukas Wunner <lukas@wunner.de>
Link: https://lore.kernel.org/r/20240124190714.1553772-1-robh@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/tpm/tpm-common.yaml

@@ -42,7 +42,7 @@ properties:
 
   resets:
     description: Reset controller to reset the TPM
-    $ref: /schemas/types.yaml#/definitions/phandle
+    maxItems: 1
 
   reset-gpios:
     description: Output GPIO pin to reset the TPM