ARM: OMAP: Move omap_init_consistent_dma_size() to local common.h

We don't want to keep it in io.h as we want to remove io.h
for omap2+ for the common zImage support.

Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/common.h

@@ -133,6 +133,8 @@ void am33xx_map_io(void);
 void omap4_map_io(void);
 void ti81xx_map_io(void);
 
+extern void __init omap_init_consistent_dma_size(void);
+
 /**
  * omap_test_timeout - busy-loop, testing a condition
  * @cond: condition to test until it evaluates to true