Revert "SystemUI: Add option to hide signal bars"

This reverts commit 865a6b48cb8f77cb3a3bc0ec5280b7705016739a.
Revert "SystemUI: WiFi Signal Text"

This reverts commit 3f33c2ca72717300e47a5814776a4f79f1d88f52.

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/WifiText.java