introduce cdev ...

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

[CFI driver] add missing flash protection for new driver

[CFI Driver] - Update Kconfig help texts ...

- Turn switch/case into if/else to be able to optimize out
	       unused code when not all bankwidths are needed

[CFI driver] For some Spansion flashes we have to write the ...

AMD_CMD_WRITE_TO_BUFFER command to the destination
	     address of the buffer write and not to the sector
	     beginning. Linux mtd does this as default, so I
	     assume this should work for other flashes aswell.
	     Reorder functions so that this change fits in nicely.

[CFI FLASH] Make the 'new' driver compile again and reorder functions to ...

get rid of static function declarations.

svn_rev_355