x86: Restore reboot quirks by DMI, fix reboot on a number of systems

x86: Restore reboot quirks by DMI, fix reboot on a number of systems

The following patch ports the functionality following changeset from
Linux (from 2008) to xen:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=14d7ca5c
It implements an additional reboot quirk to do a PCI reset via port
CF9.

This also restores some code dropped in the x86_32 target removal
(changeset 5d1181a5ea5e0f11d481a94b16ed00d883f9726e) which sets some
quirks based on DMI matching.

This will add reboot quirks on the following systems that are known to
be necessary on Linux:

    Dell E520
    Dell PowerEdge 1300
    Dell PowerEdge 300
    Dell OptiPlex 745
    Dell OptiPlex 745
    Dell OptiPlex 745
    Dell OptiPlex 330
    Dell OptiPlex 360
    Dell OptiPlex 760
    Dell PowerEdge 2400
    Dell Precision T5400
    Dell Precision T7400
    HP Compaq Laptop
    Dell XPS710
    Dell DXP061
    Sony VGN-Z540N
    ASUS P4S800
    Acer Aspire One A110
    Apple MacBook5
    Apple MacBookPro5
    Apple Macmini3,1
    Apple iMac9,1
    Dell Latitude E6320
    Dell Latitude E5420
    Dell Latitude E6220
    Dell Latitude E6420
    Dell OptiPlex 990
    Dell OptiPlex 990
    Dell Latitude E6520
    Dell OptiPlex 790
    Dell OptiPlex 990
    Dell OptiPlex 390
    Dell Latitude E6320
    Dell Latitude E6420
    Dell Latitude E6520

I clearly have not been able to test on all of these systems.
It does fix rebooting on the Dell 790, and should *not* change the
reboot paths of systems not on this DMI match list.

Signed-off-by: Ben Guthro <benjamin.guthro@citrix.com>
Use driver_data, thus requiring only a single handler function.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org
Acked-by: Ben Guthro <benjamin.guthro@citrix.com>