UPSTREAM: google/gru: support 800M/928M frequency for bob

The coreboot had no supported the different frequency for gru yet.
e.g:
we can't support the bob to run ddr 800M for rev3 board and
run 928M for rev4 board.

So, in order to support the 800M and 928M ddr frequency for bob different
boards. We will use the ram_id and board_id to select the board on bob.

BRANCH=none
BUG=b:36666655
TEST=boot from bob, tested with memtester/s2r/reboot on bob.

Change-Id: I613050292a09ff56f4636d7af285075e32259ef4
Original-Change-Id: I613050292a09ff56f4636d7af285075e32259ef4
Original-Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Original-Reviewed-on: https://review.coreboot.org/19558
Original-Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/488421
Commit-Ready: Caesar Wang <wxt@rock-chips.com>
Tested-by: Caesar Wang <wxt@rock-chips.com>
Reviewed-by: Philip Chen <philipchen@chromium.org>
14 files changed