ARM: OMAP2+: remove duplicated prototype

The am33xx_init_early prototype is defined twice.
Signed-off-by: Alejandro Lucero <alucero@os3sl.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/common.h

@@ -130,7 +130,6 @@ void am33xx_init_early(void);
 void am35xx_init_early(void);
 void ti814x_init_early(void);
 void ti816x_init_early(void);
-void am33xx_init_early(void);
 void am43xx_init_early(void);
 void am43xx_init_late(void);
 void omap4430_init_early(void);