Hello Nanjunda,
You should port your WIFI to i.MX6Q linux BSP. For hardware, there are 4 uSDHC ports, you select one to connect your WIFI. By default, on evaluation board, your wifi is not supported in BSP, but don't worry about it.
(1) Ask for WIFI driver from your provider
(2) add GPIO control signals on your circuit to BSP file.( For example, power control, wakeup control etc)
(3) add the driver to linux kernel and compile it as a module(.ko)
(4) use modprobe xxx.ko / insmod xxx.ko to load wifi driver.
(5) test steps
--using wpa_supplicant & wpa_cli to debug your wifi .
or
--using wireless-tools to debug it.(you can download latest source code and compile it)
Regards,
Weidong