Merge changes I75b3e3bf,I4cf9f1d9,I50d2ae74,Idbe62410,I84bbd06e, ... into integration

* changes:
  fix(intel): null pointer handling for resp_len
  fix(intel): define macros to handle buffer entries
  fix(intel): change SMC return arguments for INTEL_SIP_SMC_MBOX_SEND_CMD
  fix(intel): always set doorbell to SDM after sending command
  fix(intel): fix bit masking issue in intel_secure_reg_update
  fix(intel): fix ddr address range checker
  build(changelog): add new scope for Intel platform