Topology: NHLT: Intel: Fix compile warning in dmic-process.c

Topology: NHLT: Intel: Fix compile warning in dmic-process.c

This patch fixes warnings like:

intel/dmic/dmic-process.c: In function 'select_mode':
intel/dmic/dmic-process.c:498:35: warning:
format '%s' expects a matching 'char *' argument [-Wformat=]

The intended __func__ string is missing from the two fprintf()
prints for errors.

Closes: https://github.com/alsa-project/alsa-utils/pull/270
Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>