CONFIG_MMP_SRAM is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_MMP_SRAM (not configurable)

modulename: sram.ko

configname: CONFIG_MMP_SRAM

Linux Kernel Configuration
└─>MMP_SRAM
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
arch/arm/mach-mmp/sram.c
depends
CONFIG_ARCH_MMP

is depended by
CONFIG_SND_MMP_SOC