StatusBarView: Avoid unnecessary calls to mHandler.post()

Change-Id: Iea0975bce3b84e3f44a1850fc85d14bb6f7f9aa7
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Signed-off-by: David L.-W. <xD_e-mail@gmx.de>

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java