ASoC: soc-acpi: Set mach->id field on comp_ids matches

Commit dac7cbd5 ("ASoC: Intel: soc-acpi-byt: shrink tables using
compatible IDs") and commit 959ae821 ("ASoC: Intel: soc-acpi-cht:
shrink tables using compatible IDs") simplified the match tables in
soc-acpi-intel-byt-match.c and soc-acpi-intel-cht-match.c by merging
identical entries using the new .comp_ids snd_soc_acpi_mach field to
point a single entry to multiple ACPI HIDs and clearing the previously
unique per entry .id field.

But various machine drivers from sound/soc/intel/boards rely on mach->id
in one or more ways, e.g. some drivers contain the following snippets:

	adev = acpi_dev_get_first_match_dev(mach->id, NULL, -1);

	pkg_found = snd_soc_acpi_find_package_from_hid(mach->id, ...

	if (!strncmp(snd_soc_cards[i].codec_id, mach->id, 8)) { ...

All of which are broken by the match table shrinking.

Make the snd_soc_acpi_mach.id field non const (the storage for the tables
already is non const) and on a comps_ids match copy the matching HID to
the id field to fix this.

Fixes: dac7cbd5 ("ASoC: Intel: soc-acpi-byt: shrink tables using compatible IDs")
Fixes: 959ae821 ("ASoC: Intel: soc-acpi-cht: shrink tables using compatible IDs")
Suggested-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Brent Lu <brent.lu@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20211118153014.349222-1-hdegoede@redhat.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-acpi.h

@@ -147,7 +147,7 @@ struct snd_soc_acpi_link_adr {
  */
 /* Descriptor for SST ASoC machine driver */
 struct snd_soc_acpi_mach {
-	const u8 id[ACPI_ID_LEN];
+	u8 id[ACPI_ID_LEN];
 	const struct snd_soc_acpi_codecs *comp_ids;
 	const u32 link_mask;
 	const struct snd_soc_acpi_link_adr *links;

sound/soc/soc-acpi.c

@@ -20,8 +20,10 @@ static bool snd_soc_acpi_id_present(struct snd_soc_acpi_mach *machine)
 
 	if (comp_ids) {
 		for (i = 0; i < comp_ids->num_codecs; i++) {
-			if (acpi_dev_present(comp_ids->codecs[i], NULL, -1))
+			if (acpi_dev_present(comp_ids->codecs[i], NULL, -1)) {
+				strscpy(machine->id, comp_ids->codecs[i], ACPI_ID_LEN);
 				return true;
+			}
 		}
 	}