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

CONFIG_MXS_HAVE_PLATFORM_MXS_SAIF (not configurable)

modulename: platform-mxs-saif.ko

configname: CONFIG_MXS_HAVE_PLATFORM_MXS_SAIF

Linux Kernel Configuration
└─>MXS_HAVE_PLATFORM_MXS_SAIF
In linux kernel since version 3.3 (release Date: 2012-03-18)  
source code:
arch/arm/mach-mxs/devices/platform-mxs-saif.c