dt-bindings: qcom-qce: Add 'interconnects' and move 'clocks' to optional properties

Add 'interconnects' and 'interconnect-names' as optional properties
to the device-tree binding documentation for qcom crypto IP.

These properties describe the interconnect path between crypto and main
memory and the interconnect type respectively.

Cc: Thara Gopinath <thara.gopinath@linaro.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>