Revert "[Base] Nav bar tweaks"

This reverts commit 78adb435edb97de7fb570ff792501fcb4087a941.

Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
SystemUI: redraw navbar icons, add custom navbar icons back

Patchset: add sw600dp versions

Patchset: finish up the rest of the custom icons

Change-Id: I0925fe7a348a8914757caaca6c97d85fb7337f7b
[1/2] Frameworks: Doze (ambient display) timeout

Change-Id: I0eb230020da9a306e089b58db9d48b18c9743c0f
Frameworks: port SlimSeekBarPreference to SlimLP

Patchset: materialize slider preference
Change-Id: I84c16cee9162a3fd53c0b62398a2ca03415ce974