hdmi: connection: add rpi specific aidl hal

* Needed for AIDL HDMI-CEC HAL to work. Some functions that were in the
  HIDL HDMI-CEC HAL have been moved to separate HDMI connection HAL in the
  AIDL versions. Only returns connection status of HDMI ports on Pi.
  onHotplugEvent is not implemented.
* Use hardware/interfaces/tv/hdmi/connection/aidl/ as reference.

sepolicy/file.te

@@ -1 +1,2 @@
 type mediadrm_vendor_data_file, file_type, data_file_type;
+type sysfs_hdmi, file_type, sysfs_type;