tf-a: add NVM_DIR to environment

Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>
Change-Id: I43bd0284acbb39d72232124a3834b047eaae9b92
diff --git a/bionic-amd64-tf-a-build/tf-dependencies.install b/bionic-amd64-tf-a-build/tf-dependencies.install
index 5618620..7d1bf04 100755
--- a/bionic-amd64-tf-a-build/tf-dependencies.install
+++ b/bionic-amd64-tf-a-build/tf-dependencies.install
@@ -68,3 +68,11 @@
   unzip -q ${file} -d $(basename ${file} .zip)
 done
 rm -f *.zip
+
+# Install NVM
+mkdir -p ${NVM_DIR}
+curl -s https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash
+echo ". ${NVM_DIR}/nvm.sh" >> /home/buildslave/.bashrc
+chown -R buildslave:buildslave /home/buildslave/.bashrc
+. ${NVM_DIR}/nvm.sh
+nvm install 14