[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/serial_lh7a40x.c b/drivers/serial/serial_lh7a40x.c
index 8302376..d01dbe5 100644
--- a/drivers/serial/serial_lh7a40x.c
+++ b/drivers/serial/serial_lh7a40x.c
@@ -632,7 +632,7 @@
 	return uart_set_options (port, co, baud, parity, bits, flow);
 }
 
-extern struct uart_driver lh7a40x_reg;
+static struct uart_driver lh7a40x_reg;
 static struct console lh7a40x_console = {
 	.name		= "ttyAM",
 	.write		= lh7a40xuart_console_write,