mdss: hdmi: Wait for audio off
mdss: hdmi: Wait for audio off

Wait for audio off before signalling framework to shutdown
display for HDMI to ensure proper HDMI audio FIFO-DMA tear-down.

CRs-Fixed: 513391
Change-Id: I1f25d00ab159622cc21a2cf545cac2a615eca5a7
Signed-off-by: Ajay Singh Parmar <222f6e9d17c93f3930c3fccb3bb755eb5187fb82@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas