bionic-amd64-tf-a-build: Switch to Java 11

The latest Jenkins releases support only Java 11 (on the server side, and
thus on the build agent side, as the versions should match).

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Iacea4c08f8fa50935ed28e730b16a729330c325d
1 file changed