android: Add iterations option to uibench workload
Created by: joelagnel
UiBench doesn't run multiple iterations of a test which can be useful to collect average/max 50th, 90th percentile etc much like jankbench. This feature request is to add support for this so that we don't have to rely on jankbench anymore for any testing and just use uibench + gfxinfo.
Once iterations are done, we can use https://github.com/ARM-software/lisa/pull/383 to parse and collect average/max frame times etc.