google/relm: add new board as variant of cyan baseboard

Add support for google/relm (white label Chromebook) as
a variant of the cyan Braswell baseboard.

- Add board-specific code as the new relm variant
- Add new shared SPD files to baseboard

Sourced from Chromium branch firmware-strago-7287.B,
commit 02dc8db: Banon: 2nd source DDR memory (Micro-MT52L256M32D1PF)

Change-Id: Ife10f5f75435f356cd896588dd6f425e54f3c88e
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/21574
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
14 files changed