Add timestamp to 16K boot OTA

Test: th
Bug: 297536338
Change-Id: Id4919d2437079e36899cd4c56da011a29aa0b470
diff --git a/core/Makefile b/core/Makefile
index 8214c77..41b9cad 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1109,6 +1109,7 @@
 BUILT_BOOT_OTA_PACKAGE_16K := $(PRODUCT_OUT)/boot_ota_16k.zip
 $(BUILT_BOOT_OTA_PACKAGE_16K): $(OTA_FROM_RAW_IMG) $(BUILT_BOOTIMAGE_16K_TARGET) $(DEFAULT_SYSTEM_DEV_CERTIFICATE).pk8
 	$(OTA_FROM_RAW_IMG) --package_key $(DEFAULT_SYSTEM_DEV_CERTIFICATE) \
+                      --max_timestamp `cat $(BUILD_DATETIME_FILE)` \
                       --path $(HOST_OUT) \
                       --partition_name boot \
                       --output $@ \