CONFIG_MACH_VENTANA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_VENTANA.
Result is shown for kernelversion 5.3.7

Ventana board

configname: CONFIG_MACH_VENTANA

Linux Kernel Configuration
└─>Ventana board
In linux kernel since version 3.3 (release Date: 2012-03-18)  
Support for the nVidia Ventana development platform