twister: Add ICCM/DCCM to list of overflow regions

On ARC some platforms utilize ICCM/DCCM for their "flash" and "ram"
storage.  So we might get errors about overflowing one of these regions.
So treat them similar to how we treat FLASH and SRAM.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>