mb/amd/chausie: add APCB binaries if available

The APCB files that provide the firmware components running on the PSP
some mainboard-specific information like the DRAM interface
configuration. Those files aren't yet in the upstream 3rdparty/blobs
repository, so only add those files if they are present and print that
no APCB was added and the image won't boot if they aren't present.

TEST=Both cases behave as expected.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I1e8621901741b8b0531fe134273b47e85911e19f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62925
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
diff --git a/src/mainboard/amd/chausie/Makefile.inc b/src/mainboard/amd/chausie/Makefile.inc
index e494400..1e1b6d4 100644
--- a/src/mainboard/amd/chausie/Makefile.inc
+++ b/src/mainboard/amd/chausie/Makefile.inc
@@ -8,9 +8,12 @@
 ramstage-y += chromeos.c
 ramstage-y += gpio.c
 
-#TODO: add APCB binaries
-#APCB_SOURCES = $(MAINBOARD_BLOBS_DIR)/APCB_CZN_D4.bin
-#APCB_SOURCES_RECOVERY = $(MAINBOARD_BLOBS_DIR)/APCB_CZN_D4_DefaultRecovery.bin
+ifneq ($(wildcard $(MAINBOARD_BLOBS_DIR)/APCB_FT6_Updatable.bin),)
+APCB_SOURCES = $(MAINBOARD_BLOBS_DIR)/APCB_FT6_Updatable.bin
+APCB_SOURCES_RECOVERY = $(MAINBOARD_BLOBS_DIR)/APCB_FT6_DefaultRecovery.bin
+else
+$(info APCB sources not found. Skipping APCB. The resulting image won't boot.)
+endif
 
 ifeq ($(CONFIG_CHAUSIE_HAVE_MCHP_FW),y)
 $(call add_intermediate, add_mchp_fw)