mb/google/nissa/var/nivviks: Enable nau8825 ADCOUT

Enable nau8825 ADCOUT to make I2S signal meet spec.

BUG=b:234789689
TEST=I2S waveform can meet spec timing.

Signed-off-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Change-Id: I7ea472ac4e4add4e790b9b3fbb6becd40665eb1a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67660
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>

src/mainboard/google/brya/variants/nivviks/overridetree.cb

@@ -469,6 +469,7 @@ chip soc/intel/alderlake
 				register "short_key_debounce" = "2"	# 100ms
 				register "jack_insert_debounce" = "7"	# 512ms
 				register "jack_eject_debounce" = "7"	# 512ms
+				register "adcout_ds" = "true"
 				device i2c 1a on end
 			end
 		end