jammy-amd64-tf-a-build: add rustfmt

Change-Id: If8185fa7f221bb91fad396b7deda60ea397630ed
Signed-off-by: Zachary Leaf <zachary.leaf@arm.com>
diff --git a/jammy-amd64-tf-a-build/Dockerfile b/jammy-amd64-tf-a-build/Dockerfile
index 5eac731..af17509 100644
--- a/jammy-amd64-tf-a-build/Dockerfile
+++ b/jammy-amd64-tf-a-build/Dockerfile
@@ -114,7 +114,7 @@
     cargo install 'tokei@12.1.*' ;\
     cargo install cargo-binutils ;\
     rustup target add aarch64-unknown-none ;\
-    rustup component add llvm-tools
+    rustup component add llvm-tools rustfmt
 
 ENV NVM_DIR="/home/buildslave/.nvm"
 ENV BASH_ENV="${NVM_DIR}/nvm.sh"