fvp-docker-images/builders.sh: Fix/simplify echo commands

Duplicate "$", etc.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Idbf3f64a4505c12c011b5ebe04c3b4ae525f82aa
diff --git a/fvp-docker-images/builders.sh b/fvp-docker-images/builders.sh
index 90ec7cd..a3210b5 100644
--- a/fvp-docker-images/builders.sh
+++ b/fvp-docker-images/builders.sh
@@ -33,8 +33,8 @@
         set -ex
         cd $tag
         docker build --tag $ECR/fvp:$tag .
-        echo "Docker image created" && \
-        echo "Docker image name: fvp:$${tag}"
+        echo "Docker image created"
+        echo "Docker image name: fvp:${tag}"
         docker push $ECR/fvp:$tag
     )