Active display: Ability to turn off the screen, when a not clearable notification is present

Removing the last clearable notification in AD turns of the screen. But if there is a not clearable notification, there is no ability to turn it off directly.
This patch adds a power target on place of the 'clear notification' target of AD.

Change-Id: I807cca4c293ed732b441cfdcca50957b427809fa
[1/2] Base: Pimp up ActiveDisplay

This is a squashed commit of the following:

- Active display: turn off display if device gets pocketed again
  https://github.com/CyanKang/android_frameworks_base/commit/3c139633e2cb341452320207e93fd10b480b65ed

- Active display: Option to change display timeout
  https://github.com/CyanKang/android_frameworks_base/commit/31a3c7dced93bda9501915ea87f28f8fd541b650

- Active display: Add some log output
  https://github.com/CyanKang/android_frameworks_base/commit/5be6bd59c27b0994b2459e4fe360d35c43349929

- Active display: Add threshold to proximity sensor
  https://github.com/CyanKang/android_frameworks_base/commit/fc4561bf1e78d656e37b6bc51340767e1ffa03f6

  Display will only be activated if the proximity sensor was covered for 5 seconds or more.

OmniGears part: https://gerrit.omnirom.org/#/c/2818/

Change-Id: Ib934157da195eb307c3c852de3d0549ad06bd004