sst: remove rest of aava bits and aava related code

This removes the remaining bit of aava dependent and related bits from driver

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>