topology: aw88399: route deepbuffer through smart amp not HDA

Override DEEP_BUFFER_PIPELINE_SINK to route PCM 31 (deepbuffer) through
the AW88399 smart amp pipeline instead of directly to HDA analog codec.

Without this, audio goes: deepbuffer → mixout.2.1 → HDA codec (tweeters only)
With this fix: deepbuffer → mixout.20.1 → smart_amp.20.1 → SSP1 (full speakers)

This enables woofers driven by AW88399 amplifiers to work alongside tweeters.

Signed-off-by: Yakov Till <yakov.till@gmail.com>

Author: Lyapsus

tools/topology/topology2/sof-hda-generic-aw88399.conf

@@ -83,6 +83,12 @@ IncludeByKey.HDA_CONFIG {
 	"passthrough"	"cavs-passthrough-hda.conf"
 }
 
+# Override deepbuffer to route through AW88399 smart amp instead of HDA analog
+# MUST be after HDA_CONFIG include so it overrides the HDA config's Define block
+Define {
+	DEEP_BUFFER_PIPELINE_SINK	'mixout.20.1'
+}
+
 # include DMIC config if needed.
 IncludeByKey.NUM_DMICS {
 	"[1-4]"	"platform/intel/dmic-generic.conf"