Merge changes from topic "xlnx_fix_gen_op_datatype" into integration

* changes:
  fix(services): typecast operands to match data type
  fix(psci): typecast operands to match data type
  fix(common): typecast operands to match data type
  fix(arm-drivers): typecast operands to match data type
  fix(bl31): typecast operands to match data type