I am using imx8mqevk boardv3 development board Release - Linux 4.9.88_2.0.0_ga. wireless interface is missing. So on checking dmesg, I can see that bcmdhd_wlan probing fails. see below log.
[ 2.448885] bcmdhd_wlan@0 supply wlreg_on not found, using dummy regulator
[ 2.449100] bcmdhd_wlan: probe of bcmdhd_wlan@0 failed with error -1
So its a pre-build, hence wifi/bt module should be working directly, what may be the solution to start wifi and bluetooth both.