We don't have a documentation page for our TPM subsystem. I plan
on sending one in the future, but in the meantime document the
new 'tpm autostart' command in the QEMU instructions while using
a SWTPM
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>