cns3xxx: backport pci fix for cns3xxx_write_config

Fix is required to properly set pci config bits.
Original Patch: https://patchwork.ozlabs.org/patch/596170/

Signed-off-by: Pushpal Sidhu <psidhu@gateworks.com>

SVN-Revision: 49248

target/linux/cns3xxx/patches-4.4/033-CNS3xxx-Fix-PCI-cns3xxx_write_config.patch

@@ -0,0 +1,19 @@
+--- a/arch/arm/mach-cns3xxx/pcie.c
++++ b/arch/arm/mach-cns3xxx/pcie.c
+@@ -220,13 +220,13 @@ static void cns3xxx_write_config(struct
+ 	u32 mask = (0x1ull << (size * 8)) - 1;
+ 	int shift = (where % 4) * 8;
+ 
+-	v = readl_relaxed(base + (where & 0xffc));
++	v = readl_relaxed(base);
+ 
+ 	v &= ~(mask << shift);
+ 	v |= (val & mask) << shift;
+ 
+-	writel_relaxed(v, base + (where & 0xffc));
+-	readl_relaxed(base + (where & 0xffc));
++	writel_relaxed(v, base);
++	readl_relaxed(base);
+ }
+ 
+ static void __init cns3xxx_pcie_hw_init(struct cns3xxx_pcie *cnspci)