mmrnmhrm: Switch over to "new" (old) hardware.

Unfortunately, the main board has died so I needed to quickly assembly a
replacement machine. I haven't found a compatible main board for the
last set of hardware so the "new" machine is now a Core 2 Duo with only
2 GB of RAM.

I'm looking forward to more frustrations during build I already had with
the i7 I had previously.

Also, all these changes are untested for now, because I'm still
shoveling the btrfs filesystems to two new hard disks, because the new
mainboard only has 2 SATA ports.

At the moment the GRUB bootloader is still on the old disk and as soon
as the data is on the new disks, the GRUB install devices will change as
well.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
overrides: Update kernel source to v3.15-rc8.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
overrides: Update BFQ scheduler patch to v7r4.

Upstream changes:

  * Modified the code so as to be robust against late detection
    of NCQ support for a rotational device.
  * Removed a bug that hindered the correct throughput distribution on
    flash-based devices when not every process had to receive the same
    fraction of the throughput. This fix entailed also a little
    efficiency improvement, because it implied the removal of a short
    function executed in a hot path.
  * Removed quoted strings split across lines.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>