TF-M: Add tools for code coverage

lcov
ctags

Change-Id: Ie6d47a9a4d43281c387165fe1034d03bc2e35082
Signed-off-by: Karl Zhang <karl.zhang@arm.com>
diff --git a/bionic-amd64-tf-m-build/Dockerfile b/bionic-amd64-tf-m-build/Dockerfile
index 4dc380b..50df101 100644
--- a/bionic-amd64-tf-m-build/Dockerfile
+++ b/bionic-amd64-tf-m-build/Dockerfile
@@ -10,12 +10,14 @@
     default-jre \
     device-tree-compiler \
     doxygen \
+    exuberant-ctags \
     flex \
     g++-multilib \
     gcc-multilib \
     git \
     graphviz \
     jq \
+    lcov \
     libffi-dev \
     libssl-dev \
     openjdk-8-jdk \