lib/sha*: include u-boot/schedule.h instead of cyclic.h

lib/sha*: include u-boot/schedule.h instead of cyclic.h

These library routines obviously do not make use of the
cyclic_register() etc. API, but do need to call schedule(). Include
the proper header.

Eventually, their ifdef logic should be updated to avoid talking about
CONFIG_WATCHDOG.

Signed-off-by: Rasmus Villemoes <ravi@prevas.dk>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>