CONFIG_IMX_HAVE_PLATFORM_MXC_RNGA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_IMX_HAVE_PLATFORM_MXC_RNGA.
Result is shown for kernelversion 6.5.1

CONFIG_IMX_HAVE_PLATFORM_MXC_RNGA (not configurable)

modulename: platform-mxc_rnga.ko

configname: CONFIG_IMX_HAVE_PLATFORM_MXC_RNGA

Linux Kernel Configuration
└─>IMX_HAVE_PLATFORM_MXC_RNGA
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
source code:
arch/arm/mach-imx/devices/platform-mxc_rnga.c

is depended by
CONFIG_SOC_IMX31