Revert "wifi [WIP, test]"

This reverts commit 9ae603afc200c2a7938e04da3b0e1c12915f7af3.
Revert "wifi: add fw-2.bin, force load board data file"

This reverts commit ed80d6a2e2241ce1f6461adb0b5d89898614729b.
Revert "wifi: update firmware for ath6kl driver"

This reverts commit f0de9d7b0b4104f6a7c1b4e81f8170350b6051c9.