For speeding up of LWIP in RZ/A1, I added four new config processes in mbed_lib.json and lwipopts.h, overriden those values.
Since RZ/A1 incorporates a large memory, can actualize speeding up by running with the override value.
Also those new config processes will be helpful for more customize.
I changed stack size because the deafult stack size may not be enough for
Ethernet of GR-PEACH(Cortex-A).
- Stack size is default size + 128 byte
In order to maximize the performance of Ethernet, I changed heap size to
below.
- Heap size is default size * 32 byte(send descriptor num is 16 and recv
descriptoer num is 16).