Test: Output EOT (\x04) char at the end of test

When running in FVP (Fixed Virtual Platform), that will allow to terminate
running using options like fvp_mps2.UART0.shutdown_on_eot or
fvp_mps2.UART0.shutdown_tag. This is important in CI systems, etc.

A similar convention is used in TF-A tests.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I06eeef7692611c6f8cdb1aedce0e5aad440349b5
2 files changed