mimxrt/boards: Set __heap_size__ to 0 in MIMXRT1011.ld.
mimxrt/boards: Set __heap_size__ to 0 in MIMXRT1011.ld.

Do not use the traditional C heap in order to save memory, because the
traditional C heap is unused in MicroPython.

pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython