lib/drivermmc.{c,h}: Add mmc_have_interface() to see if we've got SCSI

or ATAPI or whatever.

cdda_interface: Use mmc_have_inteface() we don't have anything for
this except in GNU/Linux. May reduce the unnecessary data_bigendianp()
calls which cause lots of disc reading.

Turn #defines for MMC Profiles into enumeration.
Add enumeration for "core" interface types

#include <cdio/scsi_mmc.h> -> #include <cdio/mmc.h>

lib/driver/libcdio.sym

@@ -148,6 +148,7 @@ cdtext_is_keyword
 cdtext_set
 discmode2str
 mmc_get_hwinfo
+mmc_have_interface
 mmc_run_cmd
 track_format2str
 CDIO_SECTOR_SYNC_HEADER