Use PCI configure space read to flush PCI function reset register write to avoid...

Use PCI configure space read to flush PCI function reset register write to avoid MMIO issues (CR 128101)

When adding PCI read following LPe16000 port PCI function reset PortControl
register write for flushing the PCI pipe, the LPe16000 PortStatus register was
used for the PCI readl(). However, it might be an issue on platforms which will
not allow MMIO reads to master abort as the PCI device was not expected to
respond to a readl() following the function reset.

commit id: 2b81f942e75abda20f753e69f7a5416930ea001f

Signed-off-by: Maxim Uvarov <maxim.uvarov@oracle.com>