soc/intel/pantherlake: Enable HW managed microphone privacy

Enable hardware-managed microphone privacy by setting the
PchHdaMicPrivacyMode FSP UPD to 1. This feature was enabled by
default in FSP previously but has since changed to disabled by
default, so now coreboot explicitly enables this as it is a desired
feature for Chrome platforms.

The hardware-managed microphone privacy feature allows the platform
to control the microphone mute state at the hardware level for
enhanced privacy.

TEST=Verify UPD value is set correctly and HW managed mic privacy is
working as expected.

Change-Id: I9a20bd129103aae35550104f6a7025484ef5e9c1
Signed-off-by: Zhixing Ma <zhixing.ma@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88451
Reviewed-by: Jérémy Compostella <jeremy.compostella@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: <srinivas.kulkarni@intel.com>

src/soc/intel/pantherlake/fsp_params.c

@@ -730,6 +730,7 @@ static void fill_fsps_audio_params(FSP_S_CONFIG *s_cfg,
 	s_cfg->PchHdaMicPrivacyHwModeSoundWire3 = 1;
 	s_cfg->PchHdaMicPrivacyHwModeSoundWire4 = 1;
 	s_cfg->PchHdaMicPrivacyHwModeDmic = 1;
+	s_cfg->PchHdaMicPrivacyMode = 1;
 }
 
 static void fill_fsps_iax_params(FSP_S_CONFIG *s_cfg,