More or less, you should
- first, be able to compile the kernel source separately (prepare your own script)
- copy the driver in the appropriate place, likely drivers/net/wireless
- edit drivers/net/wireless/Kconfig to add the options for the folders you just added
- edit drivers/net/wireless/Makefile to include the folders you just added
- finally make menuconfig and make, see if you can have a working image
