CONFIG_DAVINCI_MUX is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

DAVINCI multiplexing support

modulename: mux.ko

configname: CONFIG_DAVINCI_MUX

Linux Kernel Configuration
└─>TI DaVinci
└─>DAVINCI multiplexing support
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
Pin multiplexing support for DAVINCI boards. If your bootloader
sets the multiplexing correctly, say N. Otherwise, or if unsure,
say Y.

source code: