fvp-launcher: Replace Hardcoded ECR Registry with Environment Variable

Replaced the hardcoded AWS ECR registry URL with the
${LOCAL_CONTAINER_REGISTRY} environment variable
in fvp-launcher.sh.

This allows OpenCI and arm test CI can run the same
tf-a-ci-scripts

Change-Id: Ic23178adac32556adb259c048d8b2fe12ec78190
Signed-off-by: Arthur She <arthur.she@linaro.org>
diff --git a/script/fvp-launcher.sh b/script/fvp-launcher.sh
index b13aa8c..a82695c 100755
--- a/script/fvp-launcher.sh
+++ b/script/fvp-launcher.sh
@@ -103,7 +103,7 @@
     fi
 
     if [[ "${USE_LOCAL_IMAGE}" == "true" ]]; then
-        cmd="$(echo $cmd | sed 's/987685672616.dkr.ecr.us-east-1.amazonaws.com\///g')"
+        cmd="$(echo $cmd | sed 's/${PRIVATE_CONTAINER_REGISTRY}\///g')"
     fi
 
     docker_cmd="$(echo $cmd | sed "s;--volume /;--volume $PWD/;g")"