Cleanup the mess in cpu_cache_init.

arch/mips/kernel/cpu-probe.c

arch/mips/mm/c-r3k.c

arch/mips/mm/c-r4k.c

arch/mips/mm/c-sb1.c

arch/mips/mm/c-tx39.c

arch/mips/mm/cache.c

include/asm-mips/cpu-features.h

include/asm-mips/cpu.h

include/asm-mips/mach-ip22/cpu-feature-overrides.h

include/asm-mips/mach-mips/cpu-feature-overrides.h

include/asm-mips/mach-rm200/cpu-feature-overrides.h

include/asm-mips/mach-sim/cpu-feature-overrides.h