malta: add harddisk support

malta: add harddisk support

Is it possible to backport commit r46269 (3c298f89-4303-0410-b956-a3cf2f4a3e73) to CC 15.05 in order to provide harddisk support.

Backporting tested (info available at: https://forum.openwrt.org/viewtopic.php?id=62389).

Thnx in advance!

Here is the original patch from trunk:
>From 76bfcd46bd55263947461e40bd02047922755c72 Mon Sep 17 00:00:00 2001
From: blogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Wed, 8 Jul 2015 14:25:36 +0000
Subject: [PATCH] malta: add harddisk support

works with:
qemu-system-mipsel -M malta \
-hda openwrt-malta-le-root.ext4 \
-kernel openwrt-malta-le-vmlinux.elf \
-nographic -append "root=/dev/sda console=ttyS0"

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>
git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@48666 3c298f89-4303-0410-b956-a3cf2f4a3e73