Changed to using standard header consts for int32 type.
Changed to using standard header consts for int32 type.

esteve/rosidl,ros2/rosidl_typesupport,ros2/rosidl,ros2/rosidl,ros2/rosidl_typesupport,esteve/rosidl_typesupport,ros2/rosidl,ros2/rosidl,esteve/rosidl_typesupport,ros2/rosidl_typesupport,esteve/rosidl,esteve/rosidl_typesupport,esteve/rosidl