PCI quirks: disable msi on AMD rs4xx internal gfx bridges

commit 9313ff45 upstream.

Doesn't work reliably for internal gfx.  Fixes kernel bug
https://bugzilla.kernel.org/show_bug.cgi?id=15626

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Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>