lava-templates/fvp-tftf.yaml: Decrease default lava_timeout in half

Majority of TFTF tests run under 3 minutes. Having too high a timeout
leads to problems with tests which don't produce any output (e.g., fail
to boot) or miss fail-fast clauses. So, set reasonable default timeout,
and be ready to set specific timeout for a few tests which may require
a higher value.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I5b2a87c42d162b94653b4a8f798c0af2b523dce7
1 file changed