atv_demod: Output big "PO" sound when change source from ATV [1/3]

PD#SWPL-318

Problem:
Output big "PO" sound when change source from ATV to others,
or switch between small window and full screen in ATV source.

Solution:
disable atv status early when exit ATV source.

Verify:
verified by p321

Change-Id: I82af7f8eaef181f1f72ef1f9d194e33c1efdcdb5
Signed-off-by: nengwen.chen <nengwen.chen@amlogic.com>
4 files changed