samnus: Change SPD to indicate LPDDR

There is some magic new SPD SDRAM type 241 to indicate LPDDR.
I cannot find it specificed in any JEDEC document but it is
what the reference code uses.

BUG=chrome-os-partner:22996
BRANCH=samus
TEST=emerge-samus chromeos-coreboot-samus

Change-Id: I21d7a943784435cb336ecdba7ca5eac0bf5fcd92
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/171900
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
4 files changed