default or selected kernelversion does not have config value CONFIG_RTL8192U.
Result is shown for kernelversion 6.9.9

RealTek RTL8192U Wireless LAN NIC driver

modulename: r8192u_usb.ko

configname: CONFIG_RTL8192U

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>PCI support
└─>Wireless LAN
└─>RealTek RTL8192U Wireless LAN NIC driver
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
source code:
drivers/staging/rtl8192u/