kill off pci_enable_msi_{exact,range}

I had hope that we could kill these old interfaces of for 4.10-rc,
but as of today Linus tree still has two users:

 (1) the cobalt media driver, for which I sent a patch long time ago,
     it got missed in the merge window.
 (2) the new xgbe driver was merged in 4.10-rc but used the old interfaces
     anyway

This series resend the patch for (1) and adds a new one for (2), as well
as having the final removal patch behind it.  Maybe we should just queue
up all three together in the PCI tree for 4.11?