bacon: switch to sha256 checksum

As md5 is not considered as secure since some time, and sha256 is
industry standard, lets switch over here too.

Change-Id: I22015be20126a4348affa5ef97e2c28fbd7b4717

build/tasks/bacon.mk

@@ -18,10 +18,10 @@
 
 LINEAGE_TARGET_PACKAGE := $(PRODUCT_OUT)/lineage-$(LINEAGE_VERSION).zip
 
-MD5 := prebuilts/build-tools/path/$(HOST_PREBUILT_TAG)/md5sum
+SHA256 := prebuilts/build-tools/path/$(HOST_PREBUILT_TAG)/sha256sum
 
 .PHONY: bacon
 bacon: $(INTERNAL_OTA_PACKAGE_TARGET)
 	$(hide) ln -f $(INTERNAL_OTA_PACKAGE_TARGET) $(LINEAGE_TARGET_PACKAGE)
-	$(hide) $(MD5) $(LINEAGE_TARGET_PACKAGE) | sed "s|$(PRODUCT_OUT)/||" > $(LINEAGE_TARGET_PACKAGE).md5sum
+	$(hide) $(SHA256) $(LINEAGE_TARGET_PACKAGE) | sed "s|$(PRODUCT_OUT)/||" > $(LINEAGE_TARGET_PACKAGE).sha256sum
 	@echo "Package Complete: $(LINEAGE_TARGET_PACKAGE)" >&2