omap nand: cleanup ...

- Move oob layout to driver
- make hwecc support nonoptional but selectable by the board.
- let the boards decide which buswidth / ecc type to use. They know
  better than the user which gets confused by too many kconfig options.
- Let the boards explicitly register the nand device.

I tried to seperate this further, but failed because of too many dependencies
in the code.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

[ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach ...

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

remove id fields from struct device_d ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Board:OMAP:NAND introduce generic NAND support This introduces generic nand device support including common configurations used on various OMAP platforms ...

Signed-off-by: Nishanth Menon <x0nishan@ti.com>