[ARM] mv78xx0: wire i2c support

All the pieces were ready, just matter of assembling
them together.

Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Nicolas Pitre <nico@marvell.com>

arch/arm/mach-mv78xx0/common.h

@@ -44,6 +44,7 @@ void mv78xx0_uart0_init(void);
 void mv78xx0_uart1_init(void);
 void mv78xx0_uart2_init(void);
 void mv78xx0_uart3_init(void);
+void mv78xx0_i2c_init(void);
 
 extern struct sys_timer mv78xx0_timer;