drivers/sof: Add support for max98373a using port SSP2

Some devices using the MAX98373a smart amp have the speakers connected
to port SSP2 vs the default SSP1, so add a configuration item to be
able to specify that.

TEST=tested with rest of patch train

Change-Id: I11d8011c54946aa72a83c73fa88456b4bb5d7d95
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75231
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/drivers/sof/sof.c b/src/drivers/sof/sof.c
index edc1f80..b476c1f 100644
--- a/src/drivers/sof/sof.c
+++ b/src/drivers/sof/sof.c
@@ -12,6 +12,7 @@
 {
 	switch (tplg) {
 	case max98373: return "max98373";
+	case max98373_ssp2: return "max98373-ssp2";
 	case max98360a: return "max98360a";
 	case max98357a: return "max98357a";
 	case max98357a_tdm: return "max98357a-tdm";