compat: backport PCI MSI-X entry definitions

compat: backport PCI MSI-X entry definitions

The PCI MSI-X entries were moved to uapi headers on v2.6.38
to allow drivers to use it. Older kernels will need this.

mcgrof@frijol ~/linux-stable (git::linux-3.2.y)$ git describe --contains 00aaaef9
v2.6.38-rc1~55^2~15

commit 00aaaef9a51a1a25c5d6d52ce510772f149a0eb0
Author: Sheng Yang <sheng@linux.intel.com>
Date:   Thu Nov 11 15:46:54 2010 +0800

    PCI: MSI: Move MSI-X entry definition to pci_regs.h

    Then it can be used by others.

    Reviewed-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
    Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
    Signed-off-by: Sheng Yang <sheng@linux.intel.com>
    Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>