Use the system property for the HdmiControlService configuration.

- We've used the system resoure overlay for this purpose, but we found
  that it's hard for OEM which uses PDK to override this.  Since the
  resource was already compiled and provided as a binary, so it's hard
  to change it.

Bug: 16965963
Change-Id: I868305d6f76c128d79c00ab6a8023656cd476c62