google/slippy: populate PEI SPD data for all channels

Since dual-channel setups use same RAM/SPD for both channels,
populate spd_data[1] with same SPD data as spd_data[0],
allowing info for both channels to propogate into the
SBMIOS tables.

Clean up calculations using SPD length to avoid repetition.

Changes modeled after google/auron variants.

Change-Id: I7e14b35642a3fbaecaeb7d1d33b5a7c1405bac45
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/19981
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
4 files changed