The sizes of array variables in C must be known at compile time.
Here sizeof result is a constant. However, if we assign it to a
constant variable it is still a variable to C.
* Add IPv6 data path and endpoint changes to FreeRTOS_IP.c
* Add FreeRTOS_IPv4.h and FreeRTOS_IPv6.h files.
* Fix compilation issues and run Uncrustify
