Abstract the implementation of BUILD_RING_BASE_ADDR.

This is in preparation for the introduction of the qat_4xxx driver since
the value of the ring base differs between QAT GEN2 and QAT GEN4
devices.
Signed-off-by: NGiovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: NWojciech Ziemba <wojciech.ziemba@intel.com>
Reviewed-by: NMaksim Lukoshkov <maksim.lukoshkov@intel.com>
Reviewed-by: NFiona Trahe <fiona.trahe@intel.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>