The pci express error handling extensions don't work unless PCI access is via
mmconfig. Otherwise, all accesses to pci config registers greater than 256 fail.
Since the sky2 driver has other ways of getting to PCI config space, it works
around this short coming, but the pci_find_ext_capablity doesn't work.

This backs out commit 91aeb3ed
Go back to hardcoding, since we know where the error registers are anyway.
Fixes  http://bugzilla.kernel.org/show_bug.cgi?id=7222Signed-off-by: Stephen Hemminger <shemmminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>