Following build errors reported on MIPS with gcc-8 while building Linux next-20231205 tag. But gcc-12 builds pass.

mips-linux-gnu-ld: arch/mips/mm/cache.o: in function `cpu_cache_init': cache.c:(.text+0x4f8): undefined reference to `octeon_cache_init'

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

Links: - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20231205/tes... - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20231205/tes...

-- Linaro LKFT https://lkft.linaro.org