mb/{system76,msi}: Enable PchHdaAudioLinkHdaEnable via devicetree

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: Iae2dc0a934f0ea3ca59d8a811f1daeedb090a7bd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71717
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Kopeć <michal.kopec@3mdeb.com>

src/mainboard/system76/adl/devicetree.cb

@@ -84,6 +84,7 @@ chip soc/intel/alderlake
 		end
 		device ref p2sb on end
 		device ref hda on
+			register "pch_hda_audio_link_hda_enable" = "1"
 			register "pch_hda_idisp_codec_enable" = "1"
 			register "pch_hda_idisp_link_frequency" = "HDA_LINKFREQ_96MHZ"
 			register "pch_hda_idisp_link_tmode" = "HDA_TMODE_8T"