default or selected kernelversion does not have config value CONFIG_FB_OMAP2_DSS_RFBI.
Result is shown for kernelversion 6.9.9

RFBI support

configname: CONFIG_FB_OMAP2_DSS_RFBI

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Frame buffer Devices
└─>Device Tree and Open Firmware support
└─>OMAP2+ frame buffer support
└─>RFBI support
In linux kernel since version 4.1 (release Date: 2015-06-21)  
MIPI DBI support (RFBI, Remote Framebuffer Interface, in Texas
Instrument's terminology).

DBI is a bus between the host processor and a peripheral,
such as a display or a framebuffer chip.

See http://www.mipi.org/ for DBI specifications.

depends
CONFIG_BROKEN
CONFIG_FB_OMAP2
CONFIG_HAS_IOMEM
CONFIG_OF
CONFIG_ARCH_OMAP2PLUS or CONFIG_COMPILE_TEST