imagebuilder: don't rewrite package list output

No longer rewrite opkg list output in package_list function, remove
the awk call in the pipe (which was intended for a single specific
use-case).

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit d80d1b6c42)

target/imagebuilder/files/Makefile

@@ -141,7 +141,7 @@ package_reload:
 
 package_list: FORCE
 	@$(MAKE) -s package_reload
-	@$(OPKG) list --size 2>/dev/null | awk -F" - " '{printf "%s %s %s\n", $$1, $$2, $$3}'
+	@$(OPKG) list --size 2>/dev/null
 
 package_install: FORCE
 	@echo