mtd-utils: update to 1.5.2

mtd-utils: update to 1.5.2

Drop 0001-hashtable-Remove-duplicate-hashtable_iterator_value-.patch,
the problem has been fixed upstream.
Drop backported 0001-mtd-utils-libfec-use-standard-C-type-instead-of-u_lo.patch
Rebase 0001-Fix-build-with-musl.patch (2 out of 3 fixes have been made upstream)

(From OE-Core rev: 3fba41e7f58ba68bb2e215b6f0bc21bae47ca035)

Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>