package/basefiles: add mkfs.ext4 and losetup binaries to ramfs list

mkfs.ext4 und losetup are needed for sysupgrade support on mmc devices
with automatic rootfs split (loopback device usage).

Signed-off-by: André Valentin <avalentin@marcant.net>

package/base-files/files/lib/upgrade/common.sh

@@ -69,6 +69,8 @@ run_ramfs() { # <command> [...]
 	install_bin /usr/sbin/ubirmvol
 	install_bin /usr/sbin/ubimkvol
 	install_bin /usr/sbin/partx
+	install_bin /usr/sbin/losetup
+	install_bin /usr/sbin/mkfs.ext4
 	for file in $RAMFS_COPY_BIN; do
 		install_bin ${file//:/ }
 	done