UPSTREAM: Kconfig: Add config for creating a second bootblock

Intel PCH/Southbridges have feature that it is possible
to have the southbridge/PCH look for the bootblock at a 64K or
128K/256K/512K/1MB (in case of newer SoCs) offset instead of
the usual top of flash.
Add configs to create a second bootblock and configure its size.

BUG=none
BRANCH=none
TEST=none

Change-Id: Id04badac639cd7b7f3027405d4881271c954f887
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Original-Commit-Id: b082670234819108a15da6239e481f5c9d8b30ec
Original-Change-Id: I4bbd19c35871891b762a0673f840858d972e129e
Original-Signed-off-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Original-Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Original-Reviewed-on: https://review.coreboot.org/22533
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-by: Furquan Shaikh <furquan@google.com>
Original-Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-on: https://chromium-review.googlesource.com/1143258
Commit-Ready: Patrick Georgi <pgeorgi@chromium.org>
Tested-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-by: Patrick Georgi <pgeorgi@chromium.org>
2 files changed