BYT with RT5645, RT5640, RT5651 and DA7213 all have similar
topologies with the only difference in codec name. Merge
them all into a single m4 file and set the codec name
using the macro defined during compilation.
This will also take care of adding the virtual widgets
for all the BYT topologies for compatibility with the
machine drivers.
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>