mtd: MTD related config header changes (mtdparts command)

By changing the cmd_mtdparts to only use the MTD infrastructure and
not the direct interface to the CFI NOR FLASH driver we now need
to add the MTD infrastructure to all boards using those mtdparts
commands. This patch adds those components:

CONFIG_MTD_DEVICE (for all FLASH types)

plus

CONFIG_FLASH_CFI_MTD (for NOR FLASH)

To all board maintainers: Please test this on your platforms and
report any problems/issues found. Thanks.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Ron Madrid <info@sheldoninst.com>
Cc: Georg Schardt <schardt@team-ctech.de>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Ladislav Michl <ladis@linux-mips.org>
Cc: Martin Krause <martin.krause@tqs.de>
Cc: Gary Jennejohn <garyj@denx.de>
Cc: Ricardo Ribalda <ricardo.ribalda@uam.es>