default or selected kernelversion does not have config value CONFIG_OMAP2_DSS.
Result is shown for kernelversion 6.9.5

OMAP2+ Display Subsystem support

modulename: omapdss.ko

configname: CONFIG_OMAP2_DSS

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>OMAP2+ Display Subsystem support
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
OMAP2+ Display Subsystem support.

source code: