Set M3_STRING to M3_LONG_STRING (ABI break)
Set M3_STRING to M3_LONG_STRING (ABI break)

Change-Id: Id48bbd4ba3000acf8a891445b4c890b1b42bd72f

veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi