staging: prima: Allow prima_wlan to be built inside kernel

* Prima needs wcnss to be set up when it loads.
  Therefore use a platform_driver in to notify prima that wcnss is ready.

Change-Id: I6c403f705e9dffa524a2aab54453e50775b45264
ville: Disable module loading.

* Remove deprecated config options

Change-Id: I2a5a1b253b7b4e10eb802cf7eb79c179074754c3