Arrange to insmod xzio and lzopio when booting a kernel as a Xen guest

Arrange to insmod xzio and lzopio when booting a kernel as a Xen guest

This is needed in case the Linux kernel is compiled with CONFIG_KERNEL_XZ or
CONFIG_KERNEL_LZO rather than CONFIG_KERNEL_GZ (gzio is already loaded by
grub.cfg today).

Signed-off-by: Ian Campbell <ijc@debian.org>
Bug-Debian: https://bugs.debian.org/755256
Forwarded: http://lists.gnu.org/archive/html/grub-devel/2014-11/msg00091.html
Last-Update: 2014-11-30

Patch-Name: insmod-xzio-and-lzopio-on-xen.patch