UPSTREAM: mb/google/poppy: Add support for variant SKU romstage GPIO configs

Add functionality that allows a variant SKU to have a specific set of
GPIO configs in romstage (modeled after the existing one in
ramstage)

BUG=b:245954151
TEST=builds

(cherry picked from commit 39c279acf89ec4cc7b8ca57c2e9f0f4bc897df54)

Original-Change-Id: I593a23951306908fadc00e6bc8d9d310f09c5e4b
Original-Signed-off-by: Tarun Tuli <taruntuli@google.com>
Original-Reviewed-on: https://review.coreboot.org/c/coreboot/+/73211
Original-Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Original-Reviewed-by: Subrata Banik <subratabanik@google.com>
Original-Reviewed-by: Shelley Chen <shchen@google.com>
Original-Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
GitOrigin-RevId: 39c279acf89ec4cc7b8ca57c2e9f0f4bc897df54
Change-Id: Icf918ad9ed92dcbfe0ff5e82371eaec8eabcc18c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/+/4493833
Reviewed-by: Shelley Chen <shchen@chromium.org>
Auto-Submit: Tarun Tuli <taruntuli@google.com>
Commit-Queue: Tarun Tuli <taruntuli@google.com>
Tested-by: Tarun Tuli <taruntuli@google.com>
3 files changed