Switch to bcmdhd driver

* Don't set BOARD_WLAN_DEVICE to bcmdhd, or else wpa_supplicant
  will enable P2P, which is not supported in the old firmware.
* Don't set BOARD_WLAN_DEVICE_REV to 4330_b1, as that will install
  incompatible firmware.

Change-Id: I235a3b51909cb1fe0552e942bc33c82ec4669c55