tools/wltests: sched-evaluation-full: increase PCMark iterations to 10
tools/wltests: sched-evaluation-full: increase PCMark iterations to 10

Sometimes we get noticeable variation on PCMark results when running only
5 iterations. Let's bump up to 10 in order to reduce variance.

Signed-off-by: Patrick Bellasi <431c86f368affbc3148c4669fbd465131f7e82cb@arm.com>

ARM-software/lisa,ARM-software/lisa,credp/lisa,credp/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa