fizz: Enable ddr4 DRAM support

First step in enabling mosys for Fizz with
DDR4.

BUG=b:37674370
BRANCH=None
TEST=mosys memory spd print all
     mosys memory spd dump 0

Change-Id: I2713089ce91232862726d4c4ef81a2c1077419b7
Signed-off-by: Shelley Chen <shchen@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/503550
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
17 files changed