linux-wandboard

ide: remove dead <asm-arm/arch-sa1100/ide.h>

It has been dead for more than 3 years and needs to be converted
to use platform PATA support anyway.

Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>