HDMI: check and wake up avr first [1/1]

For specific avr devices, it could still be in sleep while it
reports system audio mode ON status. This change updates the check for the avr's power status and wake it up first during system audio control initialization.

Flag: EXEMPT bugfix
Test: verified by vendor
Bug: 358671728
Change-Id: I46cbed5ab007b19dd658029c27bd3cfafa2d7853
Signed-off-by: an.xi <an.xi@amlogic.com>