ARM: OMAP2+: onenand: header cleanup

For common arm zImage existing onenand header file
in platform specific location was moved to generic
platform data location, but it contained more than
platform data, remove it. New local header has been
created for exposing functions.

Signed-off-by: Afzal Mohammed <afzal@ti.com>

arch/arm/mach-omap2/board-flash.c

@@ -25,6 +25,7 @@
 
 #include "common.h"
 #include "board-flash.h"
+#include "gpmc-onenand.h"
 
 #define REG_FPGA_REV			0x10
 #define REG_FPGA_DIP_SWITCH_INPUT2	0x60