kernel/drivers: Kill Beceem WiMAX driver. RIP

I wrote this back in 2010 as my first driver project.

Reasons to remove it:
  * The license is GPL
  * Current WiMAX hardware is generally WIFI based.
  * It controlled the hardware, but never worked
    for network access since we need SSL certs and stuff
    which vendors weren't too open with.
  * WiMAX kind of died (at least in the US)

I left the wwan directory, it would be a nice spot
for CDMA / GSM dongle drivers.

build/jam/images/definitions/minimum

@@ -208,9 +208,6 @@ SYSTEM_ADD_ONS_DRIVERS_NET = [ FFilterByBuildFeatures
 		ralinkwifi
 		wavelanwifi
 	}@ # x86,x86_64
-
-	# WWAN drivers
-	#usb_beceemwmx@gpl
 ] ;
 
 SYSTEM_ADD_ONS_DRIVERS_POWER = [ FFilterByBuildFeatures