libsffs: return 64-bit value in st_size
libsffs: return 64-bit value in st_size

Change-Id: Ife7e590279e582a233f7cd95bf16ae2ac394d9c2

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