Updating from commit id 4c523ed1: vboot2: Add support for modexp acceleration to commit id 9d4053df: Revert "Reland: Clean up implicit fall through." This brings in 32 new commmits. Among the changes are restored support for older GCC/clang versions that do not support __attribute__((fallthrough)). Signed-off-by: Julius Werner <jwerner@chromium.org> Change-Id: I1110664bf71b4376bcdd9ba934a95031ba872c1d Reviewed-on: https://review.coreboot.org/c/coreboot/+/47784 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Joel Kitching <kitching@google.com> Reviewed-by: Angel Pons <th3fanbus@gmail.com>