Add python3-jwt for crypto chip support.

Change-Id: Ie58746a1ad394b84ff020d6cc66e551871dad449
diff --git a/preamble.mk b/preamble.mk
index 086af3c..90f5d71 100644
--- a/preamble.mk
+++ b/preamble.mk
@@ -87,6 +87,7 @@
 	python \
 	python-minimal \
 	python2.7 \
+	python3-jwt \
 	python3-numpy \
 	python3-pip \
 	python3-reportbug \