MX25: tx25: Avoid the usage of extern in C file

Avoid the usage of extern in C file as pointed out by checkpatch.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

arch/arm/include/asm/arch-mx25/sys_proto.h

@@ -0,0 +1,29 @@
+/*
+ * (C) Copyright 2009
+ * Stefano Babic, DENX Software Engineering, sbabic@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef _SYS_PROTO_H_
+#define _SYS_PROTO_H_
+
+void mx25_uart1_init_pins(void);
+
+#endif

board/karo/tx25/tx25.c

@@ -29,6 +29,7 @@
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/imx25-pinmux.h>
 #include <asm/gpio.h>
+#include <asm/arch/sys_proto.h>
 
 static void mdelay(int n)
 {
@@ -142,8 +143,6 @@ void tx25_fec_init(void)
 int board_init()
 {
 #ifdef CONFIG_MXC_UART
-	extern void mx25_uart1_init_pins(void);
-
 	mx25_uart1_init_pins();
 #endif
 	/* board id for linux */