default or selected kernelversion does not have config value CONFIG_DRM_OMAP_NUM_CRTCS.
Result is shown for kernelversion 6.5.1

Number of CRTCs


Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Number of CRTCs
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Select the number of video overlays which can be used as framebuffers.
The remaining overlays are reserved for video.