cryptohome: Add Firmware Management Parameters API

This adds the get, set, and remove methods for the firmware management
parameters.

BUG=chromium:601492
TEST=as part of subsequent cryptohome change (CL:339262)

Change-Id: Iece4e4a4320fbd5393d8e12f0f11e6b12c36d6f6
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/339224
2 files changed