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/queensbay/tnc.c b/arch/x86/cpu/queensbay/tnc.c
index 30ab725..b7236e7 100644
--- a/arch/x86/cpu/queensbay/tnc.c
+++ b/arch/x86/cpu/queensbay/tnc.c
@@ -16,9 +16,9 @@
 {
 	u32 bc;
 
-	bc = pci_read_config32(PCH_LPC_DEV, 0xd8);
+	bc = x86_pci_read_config32(PCH_LPC_DEV, 0xd8);
 	bc |= 0x1;	/* unprotect the flash */
-	pci_write_config32(PCH_LPC_DEV, 0xd8, bc);
+	x86_pci_write_config32(PCH_LPC_DEV, 0xd8, bc);
 }
 
 int arch_cpu_init(void)