tests/chamelium: Reduce the simple hotplug test toggle count for VGA

Since VGA hpd detection is done through RGB lines load detection and
nowadays often goes through a bridge to some digital interface, HPD
detection usually takes a while (up to a couple seconds).

Thus, it is not as relevant to stress it as many as 15 times.
This brings the toggle count down to 5 times, which makes the test run
a lot faster without really changing the outcome much.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@linux.intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

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