Merge changes from topic "tc_refactor_dt_binding" into integration

* changes:
  refactor(tc): move SCMI nodes into the 'firmware' node
  refactor(tc): move MHUv2 property to tc2.dts
  refactor(tc): drop the 'mhu-protocol' property in DT binding
  refactor(tc): append properties in DT bindings
  refactor(tc): move SCMI clock DT binding into tc-base.dtsi
  refactor(tc): introduce a new file tc-fpga.dtsi
  refactor(tc): move out platform specific DT binding from tc-base.dtsi
  refactor(tc): move out platform specific code from tc_vers.dtsi
  refactor(tc): add platform specific DT files
  refactor(tc): rename 'tc_fvp.dtsi' to 'tc-fvp.dtsi'
  refactor(tc): introduce a new macro ADDRESSIFY()