wifi: Use broadcom's configuration overlay

Change-Id: I679423303eb2ffcd077b66e1cc25350ee89bada7
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_device_lge_e980 into kk4.4

* 'cm-11.0' of https://github.com/CyanogenMod/android_device_lge_e980:
  wifi: Use broadcom's configuration overlay