bcmdhd: Don't try to include a non-existant Android.mk for bcm4329

The mechanism for firmware inclusion was changed to product
inheritance and the call was removed for bcm4330, but it was left
in bcm4329 causing build errors for those using bcm4329 on bcmdhd.

To include the firmwares, include the following statement at the
end of device.mk:
$(call inherit-product-if-exists, hardware/broadcom/wlan/bcmdhd/firmware/bcm4329/device-bcm.mk)
dhd: add missing interface command fini

seen on Netd init (before CM banner), and also close init socket.

W/InterfaceController:
Error (Symbol not found) while searching for the interface command fini function

PS: This is not called on Wifi Toggle or AP mode switch

Change-Id: Ia19324d3a5115df8a765c6b5ca1c167a48148f7e