ASoC: SOF: add disable_function_topology flag

SOF driver will load required function topologies dynamically. However,
we prefer using the monolithic topology. Add a flag to allow user not
using the function topologies.

Signed-off-by: Bard Liao <[e-mail]>
Reviewed-by: Péter Ujfalusi <[e-mail]>
Reviewed-by: Ranjani Sridharan <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

include/sound/sof.h

···
 	const char *fw_filename;
 	const char *tplg_filename_prefix;
 	const char *tplg_filename;
+	bool disable_function_topology;
 
 	/* loadable external libraries available under this directory */
 	const char *fw_lib_prefix;

sound/soc/sof/topology.c

···
 	if (!tplg_files)
 		return -ENOMEM;
 
-	if (sof_pdata->machine && sof_pdata->machine->get_function_tplg_files) {
+	if (!sof_pdata->disable_function_topology && sof_pdata->machine &&
+	    sof_pdata->machine->get_function_tplg_files) {
 		tplg_cnt = sof_pdata->machine->get_function_tplg_files(scomp->card,
 								       sof_pdata->machine,
 								       tplg_filename_prefix,