Merge changes from topic "xlnx_fix_gen_datatype_cast" into integration

* changes:
  fix(psci): add const qualifier
  fix(el3-runtime): add const qualifier
  fix(bl31): add const qualifier
  fix(console): typecast expressions to match data type
  fix(arm-drivers): typecast expressions to match data type
  fix(arm-drivers): align essential type categories
  fix(arm-drivers): typecast expression to match data type