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

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

- Add board-specific code as the new wizpig variant
- Add new shared SPD file to the baseboard

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

Change-Id: I424d2256eb79ca3ea0a62620954c57c09ae0c0b2
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/21577
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
11 files changed