move string helpers from libcros
The only project using these funcs is libcros, so move them here
to avoid having to create a small shared library for it.
While we're at it, rename the files from "string.h" to "cros_string.h"
to avoid implicit collision with the system "string.h".
BUG=chromium-os:29973
TEST=`cbuildbot {x86,amd64,arm}-generic-full` worked
Change-Id: Ic0c5bb481f163f26108c6bcfd18e731b18ff628d
Reviewed-on: https://gerrit.chromium.org/gerrit/25044
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Chris Masone <cmasone@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
4 files changed
