Please apply commit ebabcf17bcd7 to stable release kernels (4.4..4.14)

Hi Greg,

please apply commit ebabcf17bcd7 ("MIPS: Implement __multi3 for GCC7 MIPS64r6 builds") to linux-4.4.y .. linux-4.14.y to fix the following build problem, seen when building mipsr6 images with gcc 7.3.0.

crypto/scompress.o: In function `kmalloc_array': include/linux/slab.h:603: undefined reference to `__multi3'

Thanks, Guenter