ubi-utils-klibc: clean ubiformat patch

* fixes have been committed in klibc for stdio and the additional
* fflush is not necessary anymore (runtime tested pressing CTRL+D)
* bump PR

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>