mx28: remove omap specific config options

Config options for OMAP are not used with i.MX28 so remove dead code.
Signed-off-by: NVeli-Pekka Peltola <veli-pekka.peltola@bluegiga.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: NFabio Estevam <fabio.estevam@freescale.com>
Acked-by: NStefano Babic <sbabic@denx.de>

arch/arm/cpu/arm926ejs/mx28/start.S

@@ -40,12 +40,6 @@
 #include <common.h>
 #include <version.h>
 
-#if defined(CONFIG_OMAP1610)
-#include <./configs/omap1510.h>
-#elif defined(CONFIG_OMAP730)
-#include <./configs/omap730.h>
-#endif
-
 /*
  *************************************************************************
  *