Makefile: Only add update package to all if it's actually built

Only add the update package to all if it is actually being built, fixes
default target with CONFIG_LEGACY_FLASH=y.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>

Author: JonathonHall-Purism

Makefile

@@ -183,9 +183,10 @@ $(board_build)/$(CB_UPDATE_PKG_FILE): $(board_build)/$(CB_OUTPUT_FILE)
 	cp "$<" "$(board_build)/update_pkg/"
 	cd "$(board_build)/update_pkg" && sha256sum "$(CB_OUTPUT_FILE)" >sha256sum.txt
 	cd "$(board_build)/update_pkg" && zip -9 "$@" "$(CB_OUTPUT_FILE)" sha256sum.txt
-endif
 
 all: $(board_build)/$(CB_OUTPUT_FILE) $(board_build)/$(CB_UPDATE_PKG_FILE)
+endif
+
 ifneq ($(CONFIG_COREBOOT_BOOTBLOCK),)
 all: $(board_build)/$(CB_BOOTBLOCK_FILE)
 endif