[ARM] 2907/1: GCC 4 serial driver compile fixes

Patch from Vincent Sanders

When building the ARM platforms several serial drivers fail to compile
with GCC 4.01 due to extern/static ambiguity.

Signed-off-by: Vincent Sanders <vince@arm.linux.org.uk>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 5607130..1ff629c 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -701,7 +701,7 @@
 	return uart_set_options(&uap->port, co, baud, parity, bits, flow);
 }
 
-extern struct uart_driver amba_reg;
+static struct uart_driver amba_reg;
 static struct console amba_console = {
 	.name		= "ttyAMA",
 	.write		= pl011_console_write,