x86: Add a x86_ prefix to the x86-specific PCI functions

These functions currently use a generic name, but they are for x86 only.
This may introduce confusion and prevents U-Boot from using these names
more widely.

In fact it should be possible to remove these at some point and use
generic functions, but for now, rename them.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/ivybridge/gma.c b/arch/x86/cpu/ivybridge/gma.c
index 821ea25..ea169b0 100644
--- a/arch/x86/cpu/ivybridge/gma.c
+++ b/arch/x86/cpu/ivybridge/gma.c
@@ -741,9 +741,9 @@
 	int ret;
 
 	/* IGD needs to be Bus Master */
-	reg32 = pci_read_config32(dev, PCI_COMMAND);
+	reg32 = x86_pci_read_config32(dev, PCI_COMMAND);
 	reg32 |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY | PCI_COMMAND_IO;
-	pci_write_config32(dev, PCI_COMMAND, reg32);
+	x86_pci_write_config32(dev, PCI_COMMAND, reg32);
 
 	/* Use write-combining for the graphics memory, 256MB */
 	base = pci_read_bar32(hose, dev, 2);