[PATCH] fixes to xen-pciback for v3.7 (v1)

[Konrad Rzeszutek Wilk]

One fixes that I thought I had fixed but not so. This was discovered
when trying to passthrough an PCIe network card to an PVHVM guest
and finding that it can't use MSIs. I thought I had it fixed with 
git commit 80ba77dfbce85f2d1be54847de3c866de1b18a9a
"xen/pciback: Fix proper FLR steps." but that fixed only one use
case (bind the device to xen-pciback, then unbind it).
    
The underlaying reason was that after we do an FLR (if the card supports it),
we also do a D3 (so turn off the PCIe card), then followed by a D0
(power is back).  However we did not the follow the rest of the process
that pci_reset_function does - restore the device's PCI configuration state!

(Note: We cannot use pci_reset_function as it holds a mutex that we
hold as well - so we use the low-level reset functions that we can
invoke and hold a mutex - and we forgot to do the right calls that
pci_reset_function does).

With this patch:
 [PATCH 1/2] xen/pciback: Restore the PCI config space after an FLR.

I can pass through an PCIe e1000e card succesfully to my Win7 and Linux
guest.

This patch:
 [PATCH 2/2] xen/pciback: When resetting the device don't disable

is just a cleanup.
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