storm: Add eeprom methods and enable nvram command

This adds methods necessary to support ROM-backed VBNV data on Storm
and enables the "nvram" command.

BUG=chrome-os-partner:29546
BRANCH=none
TEST="mosys nvram vboot read" shows data in RW_NVRAM region

Signed-off-by: David Hendricks <dhendrix@chromium.org>
Change-Id: Ieb0830e1d9ca491f2a81d2511042f6624e992dd2
Reviewed-on: https://chromium-review.googlesource.com/221349
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
3 files changed