Disable all jobs.

All MbedTLS jobs have been enabled on the new MbedTLS Jenkins [1]

[1]: https://mbedtls.trustedfirmware.org/

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: I4be835976804dd6da6017dd8fb28859e4be12a21
diff --git a/mbed-tls-pr-merge.yaml b/mbed-tls-pr-merge.yaml
index 521ab92..e0541fc 100644
--- a/mbed-tls-pr-merge.yaml
+++ b/mbed-tls-pr-merge.yaml
@@ -2,7 +2,7 @@
     name: mbed-tls-pr-merge
     description: 'Job for testing PRs merged with the target branch head'
     project-type: multibranch
-    disabled: false
+    disabled: true
     prune-dead-branches: true
     days-to-keep: 60
     num-to-keep: 1000