CRIS: remove MTD_AMSTD and MTD_OBSOLETE_CHIPS take two

Remove MTD_AMDSTD and MTD_OBSOLETE_CHIPS from defconfig, Kconfig and code,
instead we'll use MTD_CFI or MTD_JEDECPROBE.

[akpm@linux-foundation.org: codingl-style cleanups]
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Mikael Starvik <starvik@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>