Make initramfs alias for cpio, and make rootfs also call cpio target

Author: gsingh93

Makefile

@@ -267,14 +267,14 @@ ext4: | $(ROOTFS_DIR)
 	qemu-img convert -O $(ROOTFS_FORMAT) $(ROOTFS) $(ROOTFS).tmp
 	mv $(ROOTFS).tmp $(ROOTFS)
 
-.PHONY: cpio
-cpio: | $(INITRAMFS_DIR)
+.PHONY: cpio initramfs
+initramfs cpio: | $(INITRAMFS_DIR)
 	cd $(INITRAMFS_DIR) && find . -print0 \
 		| cpio --null --create --verbose --format=newc \
 		| gzip --best > $(CPIO_FILE)
 
 .PHONY: rootfs
-rootfs: ext4
+rootfs: ext4 cpio
 
 .PHONY: rootfs-mount
 rootfs-mount: