ci-dockerfiles-*: Remove silent-start

Both of these jobs are long-running, so it's really confusing that a CI
build start notice isn't posted as a gerrit comment, as for other jobs.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I8228728d23c60fdd373596a9bf80371618f8c9d5
diff --git a/ci-dockerfiles-deployment.yaml b/ci-dockerfiles-deployment.yaml
index 7ab52d6..2b0945a 100644
--- a/ci-dockerfiles-deployment.yaml
+++ b/ci-dockerfiles-deployment.yaml
@@ -56,7 +56,6 @@
                   branches:
                     - branch-compare-type: 'PLAIN'
                       branch-pattern: 'master'
-            silent-start: true
     execution-strategy:
         sequential: false
     wrappers:
diff --git a/ci-dockerfiles-sanity-check.yaml b/ci-dockerfiles-sanity-check.yaml
index 8fe7569..0008a77 100644
--- a/ci-dockerfiles-sanity-check.yaml
+++ b/ci-dockerfiles-sanity-check.yaml
@@ -63,7 +63,6 @@
                   branches:
                     - branch-compare-type: 'PLAIN'
                       branch-pattern: 'master'
-            silent-start: true
     execution-strategy:
         sequential: false
     wrappers: