at91dataflashboot: add a patch step

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

boot/at91dataflashboot/at91dataflashboot.mk

@@ -18,7 +18,11 @@ $(DATAFLASHBOOT_DIR)/.unpacked: $(DL_DIR)/$(DATAFLASHBOOT_SOURCE)
 	$(BZCAT) $(DL_DIR)/$(DATAFLASHBOOT_SOURCE) | tar $(TAR_STRIP_COMPONENTS)=1 -C $(@D) $(TAR_OPTIONS) -
 	touch $(DATAFLASHBOOT_DIR)/.unpacked
 
-$(DATAFLASHBOOT_DIR)/$(DATAFLASHBOOT_BINARY): $(DATAFLASHBOOT_DIR)/.unpacked
+$(DATAFLASHBOOT_DIR)/.patched: $(DATAFLASHBOOT_DIR)/.unpacked
+	toolchain/patch-kernel.sh $(@D) boot/at91dataflashboot \
+		at91dataflashboot-$(DATAFLASHBOOT_VERSION)-\*.patch
+
+$(DATAFLASHBOOT_DIR)/$(DATAFLASHBOOT_BINARY): $(DATAFLASHBOOT_DIR)/.patched
 	ls $(DATAFLASHBOOT_DIR)/.unpacked
 	make -C $(DATAFLASHBOOT_DIR) CROSS_COMPILE=$(TARGET_CROSS)