The file adf_cfg_services.h cannot be included in header files since it
instantiates the structure adf_cfg_services. Move that structure to its
own file and export the symbol.

This does not introduce any functional change.
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Damian Muszynski <damian.muszynski@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>