Add missing buildinfo dependencies.

Test: Manually via USE_BAZEL=1 m dist (fixes a failure).
Change-Id: Ideb8dfd2e13932be5dcdef780888ffd602b15bd2
diff --git a/core/sysprop.mk b/core/sysprop.mk
index 1c66281..bb19dc5 100644
--- a/core/sysprop.mk
+++ b/core/sysprop.mk
@@ -238,7 +238,7 @@
 endef
 
 gen_from_buildinfo_sh := $(call intermediates-dir-for,PACKAGING,system_build_prop)/buildinfo.prop
-$(gen_from_buildinfo_sh): $(INTERNAL_BUILD_ID_MAKEFILE) $(API_FINGERPRINT)
+$(gen_from_buildinfo_sh): $(INTERNAL_BUILD_ID_MAKEFILE) $(API_FINGERPRINT) | $(BUILD_DATETIME_FILE) $(BUILD_NUMBER_FILE)
 	$(hide) TARGET_BUILD_TYPE="$(TARGET_BUILD_VARIANT)" \
 	        TARGET_BUILD_FLAVOR="$(TARGET_BUILD_FLAVOR)" \
 	        TARGET_DEVICE="$(TARGET_DEVICE)" \