Fix touch feedback and areas for status bar date & time actions

Occupy the entire height for 48dp touch targets and better touch
background appearance. Remove the redundant background and click action
from the containing layout.

Change-Id: If343e6eb429a7fef38a23c1c9a46c75a95e50ed6

Conflicts:

	packages/SystemUI/res/layout/status_bar_expanded_header.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java