ARM: OMAP: Fix typo in board-h4.h

Replace OMAP1610 to OMAP2420.
Signed-off-by: Komal Shah <komal_shah802003@yahoo.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

include/asm-arm/arch-omap/board-h4.h

 /*
  * linux/include/asm-arm/arch-omap/board-h4.h
  *
- * Hardware definitions for TI OMAP1610 H4 board.
+ * Hardware definitions for TI OMAP2420 H4 board.
  *
  * Initial creation by Dirk Behme <dirk.behme@de.bosch.com>
  *