SystemUI: rewrite fps info tile in kt and bind service to the tile

* Binding the service makes sure that it won't live outside the lifecycle of the qs tile
* Also improved reading of fps info from the sysfs node by keeping a preloaded regex which
  finds only the first N set of integers, this way we don't have to check how the string is
  formatted, nor convert the string to a float and then round to an int.

Change-Id: Ied9d7f953d807ac13a3a63d8ff2a48903d1043d3
Signed-off-by: jhonboy121 <alfredmathew05@gmail.com>
Signed-off-by: Dmitrii <bankersenator@gmail.com>
3 files changed