add vb2api_get_pcr_digest

this api allows firmware to get the digest indicating boot mode status.

BUG=chromium:451609
TEST=VBOOT2=1 make run2tests
BRANCH=tot

Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Change-Id: Idca7bc5f6aed947689ad7cf219805aad35047c7d
Reviewed-on: https://chromium-review.googlesource.com/244542
diff --git a/Makefile b/Makefile
index ed4ccf4..ddae955 100644
--- a/Makefile
+++ b/Makefile
@@ -307,7 +307,8 @@
 	firmware/2lib/2sha1.c \
 	firmware/2lib/2sha256.c \
 	firmware/2lib/2sha512.c \
-	firmware/2lib/2sha_utility.c
+	firmware/2lib/2sha_utility.c \
+	firmware/2lib/2tpm_bootmode.c
 
 FWLIB20_SRCS = \
 	firmware/lib20/api.c \