HALO cleanup

hdpi and mdpi drawables were inconsistent, if you plan to use HALO on
lower res devices you must reproduce them.

Change-Id: I2746837bacd60c3079ace4c7523a68b8cd415f5f

Conflicts:
	core/java/com/android/internal/widget/ActionBarView.java
	packages/SystemUI/res/drawable-hdpi/halo_back_left.png
	packages/SystemUI/res/drawable-hdpi/halo_back_right.png
	packages/SystemUI/res/drawable-hdpi/halo_bg.png
	packages/SystemUI/res/drawable-hdpi/halo_bigred.png
	packages/SystemUI/res/drawable-hdpi/halo_black_x.png
	packages/SystemUI/res/drawable-hdpi/halo_dismiss.png
	packages/SystemUI/res/drawable-hdpi/halo_marker_b.png
	packages/SystemUI/res/drawable-hdpi/halo_marker_t.png
	packages/SystemUI/res/drawable-mdpi/halo_back_left.png
	packages/SystemUI/res/drawable-mdpi/halo_back_right.png
	packages/SystemUI/res/drawable-mdpi/halo_bg.png
	packages/SystemUI/res/drawable-mdpi/halo_bigred.png
	packages/SystemUI/res/drawable-mdpi/halo_black_x.png
	packages/SystemUI/res/drawable-mdpi/halo_dismiss.png
	packages/SystemUI/res/drawable-mdpi/halo_marker_b.png
	packages/SystemUI/res/drawable-mdpi/halo_marker_t.png
	packages/SystemUI/src/com/android/systemui/statusbar/halo/Halo.java