[OE-core] aufs missing in kernel 4.4

[Hongxu Jia]

Hi Bruce,

In kernel 4.1, it supports aufs:
http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-4.1/tree/fs/aufs?h=standard/base

But it does not exist in kernel 4.4:
http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-4.4/tree/fs?h=standard/base

It caused ISO's rootfs is readonly.

In meta/recipes-core/initrdscripts/files/init-live.sh:
-----------------
174     elif grep -q -w "aufs" /proc/filesystems; then
175         union_fs_type="aufs"
[snip]
204         "aufs")
205             mkdir -p /rootfs.ro /rootfs.rw
206             if ! mount -n --move $ROOT_MOUNT /rootfs.ro; then
207                 rm -rf /rootfs.ro /rootfs.rw
208                 fatal "Could not move rootfs mount point"
209             else
210                 mount -t tmpfs -o rw,noatime,mode=755 tmpfs /rootfs.rw
211                 mount -t aufs -o "dirs=/rootfs.rw=rw:/rootfs.ro=ro" 
aufs $ROOT_MOUNT
212                 mkdir -p $ROOT_MOUNT/rootfs.ro $ROOT_MOUNT/rootfs.rw
213                 mount --move /rootfs.ro $ROOT_MOUNT/rootfs.ro
214                 mount --move /rootfs.rw $ROOT_MOUNT/rootfs.rw
215             fi
216             ;;
-----------------

Would you please update kernel 4.4 to support aufs?

//Hongxu