x86/reboot: Sort reboot DMI quirks by vendor

Grouping them by vendor should make it easier to spot duplicates.
Signed-off-by: Dave Jones <davej@fedoraproject.org>
Link: http://lkml.kernel.org/r/20131001203655.GA10719@redhat.comSigned-off-by: Ingo Molnar <mingo@kernel.org>