dt-bindings: clk: qcom: drop the SC7180 Modem subsystem clock controller

This clock controller has never been used in the DT files merged to the
kernel. According to Sibi, it only worked on the pre-production devices.
For the production devices this functionality has been moved to the
firmware.

Drop the bindings now after dropping the driver itself.

Cc: Sibi Sankar <quic_sibis@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240216-drop-sc7180-mss-v1-2-0a8dc8d71c0c@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Documentation/devicetree/bindings/clock/qcom,sc7180-mss.yaml

@@ -1,61 +0,0 @@
-# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
-%YAML 1.2
----
-$id: http://devicetree.org/schemas/clock/qcom,sc7180-mss.yaml#
-$schema: http://devicetree.org/meta-schemas/core.yaml#
-
-title: Qualcomm Modem Clock Controller on SC7180
-
-maintainers:
-  - Taniya Das <quic_tdas@quicinc.com>
-
-description: |
-  Qualcomm modem clock control module provides the clocks on SC7180.
-
-  See also:: include/dt-bindings/clock/qcom,mss-sc7180.h
-
-properties:
-  compatible:
-    const: qcom,sc7180-mss
-
-  clocks:
-    items:
-      - description: gcc_mss_mfab_axi clock from GCC
-      - description: gcc_mss_nav_axi clock from GCC
-      - description: gcc_mss_cfg_ahb clock from GCC
-
-  clock-names:
-    items:
-      - const: gcc_mss_mfab_axis
-      - const: gcc_mss_nav_axi
-      - const: cfg_ahb
-
-  '#clock-cells':
-    const: 1
-
-  reg:
-    maxItems: 1
-
-required:
-  - compatible
-  - reg
-  - clocks
-  - '#clock-cells'
-
-additionalProperties: false
-
-examples:
-  - |
-    #include <dt-bindings/clock/qcom,gcc-sc7180.h>
-    clock-controller@41a8000 {
-      compatible = "qcom,sc7180-mss";
-      reg = <0x041a8000 0x8000>;
-      clocks = <&gcc GCC_MSS_MFAB_AXIS_CLK>,
-               <&gcc GCC_MSS_NAV_AXI_CLK>,
-               <&gcc GCC_MSS_CFG_AHB_CLK>;
-      clock-names = "gcc_mss_mfab_axis",
-                    "gcc_mss_nav_axi",
-                    "cfg_ahb";
-      #clock-cells = <1>;
-    };
-...