Add support for 2k Page nand with Enabled HW ECC on omap2430
v4.0. and v5. It has been Tested with Micron Nand.
Signed-off-by: Shahrom Sharif-Kashani <sshahrom@micron.com>

Moved defines from nand.h to omap2.c, cleaned up spacing and
comments a bit.
Signed-off-by: Tony Lindgren <tony@atomide.com>