[PATCH 1/2] ar7: fix build failures when CONFIG_SERIAL_8250 is not enabled

[Florian Fainelli <florian@openwrt.org>]

This patch fixes the following build failure when CONFIG_SERIAL_8250
is not enabled in the kernel configuration:
arch/mips/ar7/built-in.o: In function `ar7_register_devices':
platform.c:(.init.text+0x61c): undefined reference to `early_serial_setup'
platform.c:(.init.text+0x61c): relocation truncated to fit: R_MIPS_26 against 
`early_serial_setup'
platform.c:(.init.text+0x68c): undefined reference to `early_serial_setup'
platform.c:(.init.text+0x68c): relocation truncated to fit: R_MIPS_26 against 
`early_serial_setup'

Signed-off-by: Florian Fainelli <florian@openwrt.org>
---
diff --git a/arch/mips/ar7/platform.c b/arch/mips/ar7/platform.c
index cbe4fa4..d0624d8 100644
--- a/arch/mips/ar7/platform.c
+++ b/arch/mips/ar7/platform.c
@@ -494,8 +494,9 @@ static void __init detect_leds(void)
 static int __init ar7_register_devices(void)
 {
        int res;
-       static struct uart_port uart_port[2];
        u16 chip_id;
+#ifdef CONFIG_SERIAL_8250
+       static struct uart_port uart_port[2];
 
        memset(uart_port, 0, sizeof(struct uart_port) * 2);
 
@@ -526,7 +527,7 @@ static int __init ar7_register_devices(void)
                if (res)
                        return res;
        }
-
+#endif /* CONFIG_SERIAL_8250 */
        res = platform_device_register(&physmap_flash);
        if (res)
                return res;