PCI: designware: Remove unnecessary use of 'conf_lock' spinlock

Serialization of configuration accesses is provided by 'pci_lock' in
drivers/pci/access.c thus making the driver's 'conf_lock' superfluous.

Signed-off-by: Andrew Murray <amurray@embedded-bits.co.uk>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Richard Zhu <r65037@freescale.com>

diff --cc drivers/pci/host/pci-exynos.c
Simple merge

diff --cc drivers/pci/host/pci-imx6.c
Simple merge

diff --cc drivers/pci/host/pcie-designware.c
Simple merge

diff --cc drivers/pci/host/pcie-designware.h
Simple merge