mb/google/volteer: Add SOF chip driver

Add SOF chip driver entries for all variants, so that the correct audio
config is passed to the OS drivers.

TEST=build, boot Windows on several volteer variants, verify audio
functional under Windows using coolstar's SOF drivers.

Change-Id: I62a96149cec9eeb7b2da8a2337083969a1b0fce0
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74816
Reviewed-by: CoolStar <coolstarorganization@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>
diff --git a/src/mainboard/google/volteer/variants/elemi/overridetree.cb b/src/mainboard/google/volteer/variants/elemi/overridetree.cb
index 2ad6c08..2152ec4 100644
--- a/src/mainboard/google/volteer/variants/elemi/overridetree.cb
+++ b/src/mainboard/google/volteer/variants/elemi/overridetree.cb
@@ -272,6 +272,12 @@
 				register "sdmode_delay" = "5"
 				device generic 0 on end
 			end
+			chip drivers/sof
+				register "spkr_tplg" = "max98357a"
+				register "jack_tplg" = "rt5682"
+				register "mic_tplg" = "_2ch_pdm0"
+				device generic 0 on end
+			end
 		end
 		device ref pcie_rp5 on end
 		device ref pmc hidden