mtdutils: 1.5.2 -> 2.1.1 (#62805)

* mtdutils: 1.5.2 -> 2.1.0

http://lists.infradead.org/pipermail/linux-mtd/2019-March/088267.html

And the previous releases, hardcoded version in URL I think caused
this to be missed by auto-updaters for a while now.

1.5.2, FWIW in 2015:

http://lists.infradead.org/pipermail/linux-mtd/2015-August/060723.html

* mtd-utils: 2.1.0 -> 2.1.1

+ cleanup
+ enable tests and parallel building
+ add zstd support