Commit ece400ed

 interacts with changes in poky, dunfell due to a
backport patch for mtd-utils. Instead of updating the version, just take
the commits from mtd-utils master branch that are needed by SWUpdate.

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Richard Allen <richard_allen@keysight.com>
CC: Bastian Germann <bage@linutronix.de>
CC: Guy Morand <guy@guy-morand.ch>