Docker: Update TF-M to use new docker image

This change removes a generic image and splits out TF-A and TF-M to use
a different docker images

Change-Id: I36db13cfdffe75273f992f09d7314bd089faa60e
Signed-off-by: Benjamin Copeland <ben.copeland@linaro.org>
diff --git a/jenkins/build-docs.jpl b/jenkins/build-docs.jpl
index a677c26..559f94d 100644
--- a/jenkins/build-docs.jpl
+++ b/jenkins/build-docs.jpl
@@ -9,7 +9,7 @@
 @Library('trustedfirmware') _
 import org.trustedfirmware.Gerrit
 
-node("docker-amd64-bionic") {
+node("docker-amd64-tf-m-bionic") {
   stage("Init") {
     cleanWs()
     dir("trusted-firmware-m") {