uboot-imx

mtd: sf: Zap ramtron driver

Removed ramtron driver since the EMK boards are
no longer been active, and these are the only boards
used this flash driver.

Commit details for EMK zap:
"ppc/arm: zap EMK boards"
(sha1: d58a9451e7339ed4cf2b2627e534611f427fb791)

Signed-off-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
Cc: Reinhard Meyer <reinhard.meyer@emk-elektronik.de>