use prebuilt kernel for now

for some reason building the wifi module in-line with android produces
a faulty wlan.ko module. When built standalone it works perfectly though.
Use a prebuilt kernel for now

Change-Id: I26950e21279c3b3150f7799a8cb8731a96b2b1d2
Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
Merge "use prebuilt kernel for now" into illusion-4.4