Add labels to MTD partitions.

Add labels to MTD partitions and clean up some of the show code, adding more
info on the MTD prints and eliminating duplicated code.

BRANCH=none
TEST=make runtests & manual cgpt add -l "label"; cgpt show to verify labels
BUG=none

Original-Change-Id: I59736128f394c2aca937a3a0bb5fc5d42b0149a9
Reviewed-on: https://gerrit.chromium.org/gerrit/63367
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
Tested-by: Albert Chaulk <achaulk@chromium.org>
(cherry picked from commit 32fd6dead10a8255fea27f6e5ce9ba92d8716008)

Change-Id: Ic24c047cc9680f6ef6143f776270d12f16608d68
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/64225
3 files changed