Revert "2lib/2api: Deprecate vb2ex_ec_trusted()"

This reverts commit 7c73bb07fd3ca45ce650b993a9c6a5850ddb2707.

Reason for revert: b:202258389

Original change's description:
> 2lib/2api: Deprecate vb2ex_ec_trusted()
>
> coreboot will support check the EC_IN_RW during verstage_main(), which
> performs the equivalent tasks as vb2ex_ec_trusted().
>
> In the previous CL, we remove the check of vb2ex_ec_trusted(), so the
> whole implementation of this function among vboot_reference and
> depthcharge could be deprecated and removed.
>
> BUG=b:181931817
> BRANCH=none
> TEST=CC=x86_64-pc-linux-gnu-clang;
>      make clean && make runtests
> TEST=emerge coreboot vboot_reference depthcharge
>
> Cq-Depend: chromium:3139956
> Signed-off-by: Hsuan Ting Chen <roccochen@chromium.org>
> Change-Id: I4f592d7dec2480475762e1336791cbb34fa143ba
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3139539
> Reviewed-by: Julius Werner <jwerner@chromium.org>
> Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>

Bug: b:181931817
Change-Id: Ia127ce89b7f9413db9fd6ca4561ad06efb36d7e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3211006
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Bhanu Prakash Maiya <bhanumaiya@google.com>
4 files changed