FreeBSD: install openjdk11

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: I1ac02e2cc87d350bde39dab964cc6bef30ad452f
diff --git a/freebsd.sh b/freebsd.sh
index d4fd3ae..9bc3086 100644
--- a/freebsd.sh
+++ b/freebsd.sh
@@ -4,7 +4,7 @@
     curl \
     git \
     gnupg \
-    openjdk8 \
+    openjdk11 \
     python3 \
     unzip \
     cmake \