vboot: Add vb2api_is_oem_lock_enabled function Add vb2api_is_oem_lock_enabled function that allows depthcharge to check current state of OEM Lock in nvdata. BRANCH=main BUG=b:484260435 TEST=Check OEM Lock in depthcharge Change-Id: I83f6579d51a905464bf79d2c878a4e30f9a2c266 Signed-off-by: Tomasz Michalec <tmichalec@google.com> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/7674957 Reviewed-by: Jakub "Kuba" Czapiga <czapiga@google.com>