mpc83xx: add PCISLAVE support to 83XX_GENERIC_PCI setup code
This adds a helper function to unlock the PCI configuration bit, so that any extra PCI setup (such as outbound windows, etc.) can be done after using the 83XX_GENERIC_PCI code to set up the PCI bus. Signed-off-by: NIra W. Snyder <iws@ovro.caltech.edu> Signed-off-by: NKim Phillips <kim.phillips@freescale.com>
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