ARM: iop13xx: fix missing declaration of iop13xx_init_early

Commit 1dfe34ae (ARM: iop13xx: use runtime ioremap hook) missed
a declaration of iop13xx_init_early resulting in a build error.
Signed-off-by: NRob Herring <rob.herring@calxeda.com>

arch/arm/mach-iop13xx/include/mach/iop13xx.h

@@ -5,6 +5,7 @@
 /* The ATU offsets can change based on the strapping */
 extern u32 iop13xx_atux_pmmr_offset;
 extern u32 iop13xx_atue_pmmr_offset;
+void iop13xx_init_early(void);
 void iop13xx_init_irq(void);
 void iop13xx_map_io(void);
 void iop13xx_platform_init(void);