Azure: Set the timeout for jobs to the maximum

As per current Azure Pipelines documentation we qualify for 3600 minutes
per job, if specified, as the timeout. The default unspecified timeout
is 60 minutes. Rework things to specify 0 as the timeout (and so maximum
allowed) so that we don't have failures due to running slightly past 60
minutes total.

Link: https://learn.microsoft.com/en-us/azure/devops/pipelines/process/phases?view=azure-devops&tabs=yaml#timeouts


Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>