mb/system76/rpl: Hook up TAS5825M init

Ensure per-board smart amp init is configured. Fixes speaker output on
oryp12.

Change-Id: I40ff1889dd144bf83ef85979a55535493aa7abdd
Fixes: 8b9716e2269d ("mb/system76/rpl: Add Oryx Pro 12 as a variant")
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82726
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jeremy Soller <jeremy@system76.com>
diff --git a/src/mainboard/system76/rpl/Makefile.mk b/src/mainboard/system76/rpl/Makefile.mk
index cf92eb2..2c8dfba 100644
--- a/src/mainboard/system76/rpl/Makefile.mk
+++ b/src/mainboard/system76/rpl/Makefile.mk
@@ -10,5 +10,6 @@
 ramstage-y += ramstage.c
 ramstage-y += variants/$(VARIANT_DIR)/hda_verb.c
 ramstage-y += variants/$(VARIANT_DIR)/gpio.c
+ramstage-$(CONFIG_DRIVERS_I2C_TAS5825M) += variants/$(VARIANT_DIR)/tas5825m.c
 
 SPD_SOURCES = samsung-M425R1GB4BB0-CQKOD