pci: set pci=bfsort for PowerEdge R900

This patch automatically enables pci=bfsort for the Dell PowerEdge
R900.  This is necessary to ensure the onboard NICs enumerate in the
proper order, similar to the other systems already on the list.

Signed-off-by: Matt Domsch <Matt_Domsch@dell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>