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

CONFIG_MIPS_SPRAM (not configurable)

modulename: spram.ko

configname: CONFIG_MIPS_SPRAM

Linux Kernel Configuration
└─>MIPS_SPRAM
In linux kernel since version 4 (release Date: 2015-04-12)  
source code:
arch/mips/kernel/spram.c