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/baytrail/early_uart.c b/arch/x86/cpu/baytrail/early_uart.c
index 4199210..b64a3a9 100644
--- a/arch/x86/cpu/baytrail/early_uart.c
+++ b/arch/x86/cpu/baytrail/early_uart.c
@@ -50,7 +50,7 @@
 	writel(reg, pconf0_addr);
 }
 
-static void pci_write_config32(int dev, unsigned int where, u32 value)
+static void x86_pci_write_config32(int dev, unsigned int where, u32 value)
 {
 	unsigned long addr;
 
@@ -62,7 +62,8 @@
 int setup_early_uart(void)
 {
 	/* Enable the legacy UART hardware. */
-	pci_write_config32(PCI_DEV_CONFIG(0, LPC_DEV, LPC_FUNC), UART_CONT, 1);
+	x86_pci_write_config32(PCI_DEV_CONFIG(0, LPC_DEV, LPC_FUNC), UART_CONT,
+			       1);
 
 	/*
 	 * Set up the pads to the UART function. This allows the signals to