CONFIG_RM7000_CPU_SCACHE is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_RM7000_CPU_SCACHE (not configurable)

modulename: sc-rm7k.ko

configname: CONFIG_RM7000_CPU_SCACHE

Linux/MIPS Kernel Configuration
└─>Kernel type
└─>RM7000_CPU_SCACHE
In linux kernel since version 2.6.12  
source code:
arch/mips/mm/sc-rm7k.c