Add permission to read HDMI states by audio hal.
For new project is using
/devices/platform/dwc_dptx-audio/extcon/hdmi_audio
For old projects are using
/devices/platform/drmdp-adma/extcon/hdmi_audio
Bug: 328784922
Test: builds
Flag: EXEMPT update sepolocy
Change-Id: I3bd0ccf1ee804de3157e759eac275673c9fc96a2
Signed-off-by: Robert Lee <lerobert@google.com>