FW:  Bring Autohide to SystemBar (1/2)

AutoHide for SystemBar (TabUI)

ps 2:  Fix screen reset/calcs in PWM

Change-Id: I194d4e0d0343aac809bcee8b93a0ddd43341c64a
Signed-off-by: Zaphod <mwilson@acesappraisal.com>