qcacld: nuke Kconfig-based configuration entirely

This method of building qcacld isn't meant to be used and
causes conflicts with the new OEM profile configuration.

Configuration is now done with drivers/staging/qcacld-3.0/configs.

Signed-off-by: Park Ju Hyung <qkrwngud825@gmail.com>
(cherry picked from commit 1bdd23fcaaef57db47ea69720f51aed47353482c)