Change root_fs_$(ARCH) to rootfs.$(ARCH)

package/Makefile.in

@@ -27,7 +27,7 @@ TOOL_BUILD_DIR=$(BASE_DIR)/toolchain_build_$(ARCH)$(ARCH_FPU_SUFFIX)
 STAGING_DIR:=$(strip $(subst ",, $(BR2_STAGING_DIR)))
 #"
 TARGET_PATH=$(STAGING_DIR)/bin:/bin:/sbin:/usr/bin:/usr/sbin
-IMAGE:=$(BASE_DIR)/root_fs_$(ARCH)$(ARCH_FPU_SUFFIX)
+IMAGE:=$(BASE_DIR)/rootfs.$(ARCH)$(ARCH_FPU_SUFFIX)
 REAL_GNU_TARGET_NAME=$(OPTIMIZE_FOR_CPU)-linux-uclibc
 GNU_TARGET_NAME=$(OPTIMIZE_FOR_CPU)-linux
 KERNEL_CROSS=$(STAGING_DIR)/bin/$(OPTIMIZE_FOR_CPU)-linux-uclibc-