nsm: Increase build timeout for Meridio jobs

Heavy development is going on with Meridio and image build times
are increasing, causing periodic jobs to fail due to timeout.

This change increases build timeout for all jobs in order to
prevent builds failing due to increased build times so we can
continue building images periodically and avoid verify and foss
jobs to fail unnecessarily.

See failures below.
https://jenkins.nordix.org/view/NSM/

Change-Id: If14a8c93a1f0ef5afffd3b548dab330f0c8be1eb