TF-M: Add Bionic image

Based of the xenial image this builds a Bionic image for the TF-M
project.

Change-Id: Ie620de26f0c27098aee2f5ebb0b74867669c8aa4
Signed-off-by: Benjamin Copeland <ben.copeland@linaro.org>
diff --git a/bionic-amd64-tf-m-build/requirements_python2.txt b/bionic-amd64-tf-m-build/requirements_python2.txt
new file mode 100644
index 0000000..4449ba8
--- /dev/null
+++ b/bionic-amd64-tf-m-build/requirements_python2.txt
@@ -0,0 +1 @@
+pygments==2.2.0