Provide MTD version of common functions

Provide an MTD implementation of several common functions in cgpt_common.c

BUG=chromium:221745
BRANCH=none
TEST=none

Original-Change-Id: Ib3248c283ca31e33a91b9ea0c14b2f72ea7c5850
Reviewed-on: https://gerrit.chromium.org/gerrit/47029
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
Tested-by: Albert Chaulk <achaulk@chromium.org>
(cherry picked from commit b0bd7e4cf8dd15cc3c371dac157093c7e7c7a874)

Change-Id: I243c2bf98a88d0019c332b274868459b5f1b8ea1
Reviewed-on: https://gerrit.chromium.org/gerrit/49791
Reviewed-by: Albert Chaulk <achaulk@chromium.org>
Tested-by: Albert Chaulk <achaulk@chromium.org>
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
4 files changed