mtd-utils: use latest Gentoo upstream version.

This get the latest Gentoo upstream mtd-utils-1.5.2. It changes
the KEYWORD to '*' and bumped version.

BUG=chromium:895954
TEST=sudo emerge mtd-utils

Change-Id: I00db0c190aa7467234de0648a62cd3402e7c85b2
Reviewed-on: https://chromium-review.googlesource.com/1284150
Commit-Ready: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
4 files changed