vboot_logic: Set VB2_CONTEXT_EC_TRUSTED in verstage_main

vboot_reference is introducing a new field (ctx) to store the current
boot mode in crrev/c/2944250 (ctx->bootmode), which will be leveraged
in both vboot flow and elog_add_boot_reason in coreboot.

In current steps of deciding bootmode, a function vb2ex_ec_trusted
is required. This function checks gpio EC_IN_RW pin and will return
'trusted' only if EC is not in RW. Therefore, we need to implement
similar utilities in coreboot.

We will deprecate vb2ex_ec_trusted and use the flag,
VB2_CONTEXT_EC_TRUSTED, in vboot, vb2api_fw_phase1 and set that flag
in coreboot, verstage_main.

Also add a help function get_ec_is_trusted which needed to be
implemented per mainboard.

TODO: mancomb

BUG=b:177196147, b:181931817
BRANCH=none
TEST=TBD

Signed-off-by: Hsuan Ting Chen <roccochen@chromium.org>
Change-Id: I479c8f80e45cc524ba87db4293d19b29bdfa2192
---
M src/include/bootmode.h
M src/mainboard/google/asurada/chromeos.c
M src/mainboard/google/auron/chromeos.c
M src/mainboard/google/beltino/chromeos.c
M src/mainboard/google/brya/chromeos.c
M src/mainboard/google/butterfly/chromeos.c
M src/mainboard/google/cherry/chromeos.c
M src/mainboard/google/cyan/chromeos.c
M src/mainboard/google/daisy/chromeos.c
M src/mainboard/google/dedede/chromeos.c
M src/mainboard/google/deltaur/chromeos.c
M src/mainboard/google/drallion/chromeos.c
M src/mainboard/google/eve/chromeos.c
M src/mainboard/google/fizz/chromeos.c
M src/mainboard/google/foster/chromeos.c
M src/mainboard/google/gale/chromeos.c
M src/mainboard/google/glados/chromeos.c
M src/mainboard/google/gru/chromeos.c
M src/mainboard/google/guybrush/chromeos.c
M src/mainboard/google/hatch/chromeos.c
M src/mainboard/google/herobrine/chromeos.c
M src/mainboard/google/jecht/chromeos.c
M src/mainboard/google/kahlee/chromeos.c
M src/mainboard/google/kukui/chromeos.c
M src/mainboard/google/link/chromeos.c
M src/mainboard/google/mancomb/chromeos.c
M src/mainboard/google/mistral/chromeos.c
M src/mainboard/google/nyan/chromeos.c
M src/mainboard/google/nyan_big/chromeos.c
M src/mainboard/google/nyan_blaze/chromeos.c
M src/mainboard/google/oak/chromeos.c
M src/mainboard/google/octopus/chromeos.c
M src/mainboard/google/parrot/chromeos.c
M src/mainboard/google/peach_pit/chromeos.c
M src/mainboard/google/poppy/chromeos.c
M src/mainboard/google/rambi/chromeos.c
M src/mainboard/google/reef/chromeos.c
M src/mainboard/google/sarien/chromeos.c
M src/mainboard/google/slippy/chromeos.c
M src/mainboard/google/smaug/chromeos.c
M src/mainboard/google/storm/chromeos.c
M src/mainboard/google/trogdor/chromeos.c
M src/mainboard/google/veyron/chromeos.c
M src/mainboard/google/veyron_mickey/chromeos.c
M src/mainboard/google/veyron_rialto/chromeos.c
M src/mainboard/google/volteer/chromeos.c
M src/mainboard/google/zork/chromeos.c
M src/security/vboot/bootmode.c
M src/security/vboot/vboot_logic.c
M src/soc/intel/alderlake/Makefile.inc
M src/soc/intel/apollolake/Makefile.inc
M src/soc/intel/skylake/Makefile.inc
52 files changed, 329 insertions(+), 0 deletions(-)