jammy-amd64-tf-a-build: Use explicit Rust version; update to 1.82.0

We also install the needed version in 1st invocation of the downloaded
rustup script, and avoid 2nd call to "rustup default".

Addresses https://linaro.atlassian.net/browse/TFC-677

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I638c2fd695e96d85950d48b4e858ce9fef40a3ac
1 file changed