default or selected kernelversion does not have config value CONFIG_USB_GADGET_SELECTED.
Result is shown for kernelversion 5.6.18
CONFIG_USB_GADGET_SELECTED (not configurable)
configname: CONFIG_USB_GADGET_SELECTED
Linux Kernel Configuration
└─>Device Drivers
└─>USB support
└─>USB Gadget Support
└─>USB_GADGET_SELECTED