feat(bl): add interface to query TF-A semantic ver

Adding interface for stand-alone semantic version of TF-A
for exporting to RSS attestation, and potentially other areas
as well.

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: Ib4a2c47aa1e42a3b850185e674c90708a05cda53
diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk
index a58caf5..abdd4d0 100644
--- a/make_helpers/build_macros.mk
+++ b/make_helpers/build_macros.mk
@@ -499,7 +499,8 @@
 	$(call MAKE_BUILD_STRINGS, $(BUILD_DIR)/build_message.o)
 else
 	@echo 'const char build_message[] = "Built : "$(BUILD_MESSAGE_TIMESTAMP); \
-	       const char version_string[] = "${VERSION_STRING}";' | \
+	       const char version_string[] = "${VERSION_STRING}"; \
+	       const char version[] = "${VERSION}";' | \
 		$$(CC) $$(TF_CFLAGS) $$(CFLAGS) -xc -c - -o $(BUILD_DIR)/build_message.o
 endif
 ifneq ($(findstring armlink,$(notdir $(LD))),)