jammy-amd64-tf-a-build: Add rustc-src component for nightly builds

Building the standard library with `-Zbuild-std` requires that the
`rust-src` component be installed.

Change-Id: I49a947a3f67773319e7070f2705b0d4c3270c35a
Signed-off-by: Matthew Maurer <mmaurer@google.com>
1 file changed