imagebuilder: explicitly install the kernel .ipk before installing anything...

imagebuilder: explicitly install the kernel .ipk before installing anything else, it is no longer part of the package index (fixes #11450)

SVN-Revision: 31711

target/imagebuilder/files/Makefile

@@ -126,6 +126,7 @@ package_index: FORCE
 package_install: FORCE
 	@echo
 	@echo Installing packages...
+	$(OPKG) install $(PACKAGE_DIR)/kernel_*.ipk
 	$(OPKG) install $(BUILD_PACKAGES)
 	rm -f $(TARGET_DIR)/usr/lib/opkg/lists/*