Enable LiteX SoC Controller driver

modulename: litex_soc_ctrl.ko

configname: CONFIG_LITEX_SOC_CONTROLLER

Linux Kernel Configuration
└─>Device Drivers
└─>SOC (System On Chip) specific Drivers
└─>Enable LiteX SoC Builder specific drivers
└─>Device Tree and Open Firmware support
└─>Enable LiteX SoC Controller driver
In linux kernel since version 5.2 (release Date: 2019-07-07)  
This option enables the SoC Controller Driver which verifies
LiteX CSR access and provides common litex_get_reg/litex_set_reg
accessors.
All drivers that use functions from litex.h must depend on
LITEX.

source code:
selects
CONFIG_LITEX

depends
CONFIG_HAS_IOMEM
CONFIG_COMPILE_TEST or CONFIG_OF