Squash commit : Change torch to lightbulb

Change torch to lightbulb on Powermenu

[1/2] Improve flash availability check.

* Use simple overlay, default false.

PS2: Add header and proper symbol.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: I40458959d738fbd82941a19ff1ffcfa236bffcb9

Conflicts:
	core/java/android/provider/Settings.java
	core/res/res/values/psx_symbols.xml

PS1: fix a derp

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsModel.java
[1/2] Base: Speed up booting on multicore devices

- Add multithreading support to Installer/installd
- Parallelize package scanning
- Parallelize boot dexopt

Change-Id: Ia6b815bde0e5cdf996fdfdec3ba228bcde9e4e0b
Because 90% isnt full