dt-bindings: arm: qcom: Document SDX75 platform and boards

Document the SDX75 platform binding and also the boards using it.
Signed-off-by: Rohit Agarwal <quic_rohiagar@quicinc.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/1686311438-24177-2-git-send-email-quic_rohiagar@quicinc.com

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -70,6 +70,7 @@ description: |
         sdm845
         sdx55
         sdx65
+        sdx75
         sm4250
         sm6115
         sm6115p
@@ -828,6 +829,11 @@ properties:
               - qcom,sdx65-mtp
           - const: qcom,sdx65
 
+      - items:
+          - enum:
+              - qcom,sdx75-idp
+          - const: qcom,sdx75
+
       - items:
           - enum:
               - qcom,ipq6018-cp01
@@ -1056,6 +1062,7 @@ allOf:
               - qcom,sdm845
               - qcom,sdx55
               - qcom,sdx65
+              - qcom,sdx75
               - qcom,sm4250
               - qcom,sm6115
               - qcom,sm6125