[BYOC][ACL] ACL migrated to v21.02

This PR switches ACL* version from v20.11 to v21.02

ACL stands for Compute Library for the Arm® Architecture.

Change-Id: Id364b571d5611ca6eb6d2bde09448a65aae3f73b

docker/install/ubuntu_install_arm_compute_lib.sh

@@ -58,8 +58,8 @@ git clone "$repo_url" "$repo_dir"
 
 cd "$repo_dir"
 
-# pin version to v20.11
-git checkout 49b8f90
+# pin version to v21.02
+git checkout 7dcb9fa
 
 if [ "$architecture_type" != "aarch64" ]; then
   build_type="cross_compile"