As the common hw_data files are growing and the adf_hw_csr_ops is going
to be extended with new operations, move all logic related to ring CSRs
to the newly created adf_gen[2|4]_hw_csr_data.[c|h] files.

This does not introduce any functional change.
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Xin Zeng <xin.zeng@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>