topology: Fix issue in parsing routes when generating topology binary
topology: Fix issue in parsing routes when generating topology binary

We missed parsing the index value, which is used as a use case indicator, when
processing the route objects.

This patch fixes the bug.

Signed-off-by: Fuwei Tang <f21b390ec5c26db20c1a6309c43b3f6bfcc11b9b@intel.com>
Tested-by: Subhransu S. Prusty <5802be247caf66408bd024ec19beeb4100b80acb@intel.com>
Signed-off-by: Takashi Iwai <4596b3305151c7ee743192a95d394341e3d3b644@suse.de>

alsa-project/alsa-lib,takaswie/alsa-lib,takaswie/alsa-lib,takaswie/alsa-lib,takaswie/alsa-lib,tiwai/alsa-lib,alsa-project/alsa-lib,alsa-project/alsa-lib,takaswie/alsa-lib,tiwai/alsa-lib,tiwai/alsa-lib,alsa-project/alsa-lib,tiwai/alsa-lib