dt-bindings: cpu: Drop duplicate nvidia,tegra186-ccplex-cluster.yaml

"nvidia,tegra186-ccplex-cluster" is also documented in
arm/tegra/nvidia,tegra-ccplex-cluster.yaml. As it covers Tegra234 as
well, drop nvidia,tegra186-ccplex-cluster.yaml.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240910234422.1042486-1-robh@kernel.orgSigned-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/cpu/nvidia,tegra186-ccplex-cluster.yaml

-# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
-%YAML 1.2
----
-$id: http://devicetree.org/schemas/cpu/nvidia,tegra186-ccplex-cluster.yaml#
-$schema: http://devicetree.org/meta-schemas/core.yaml#
-
-title: NVIDIA Tegra186 CCPLEX Cluster
-
-maintainers:
-  - Thierry Reding <thierry.reding@gmail.com>
-  - Jon Hunter <jonathanh@nvidia.com>
-
-properties:
-  compatible:
-    const: nvidia,tegra186-ccplex-cluster
-
-  reg:
-    maxItems: 1
-
-  nvidia,bpmp:
-    description: phandle to the BPMP used to query CPU frequency tables
-    $ref: /schemas/types.yaml#/definitions/phandle
-
-additionalProperties: false
-
-required:
-  - compatible
-  - reg
-  - nvidia,bpmp
-
-examples:
-  - |
-    ccplex@e000000 {
-        compatible = "nvidia,tegra186-ccplex-cluster";
-        reg = <0x0e000000 0x400000>;
-        nvidia,bpmp = <&bpmp>;
-    };