HDMI: Enable CEC on boot-up if low energy mode is selected

This change sets the variable mHdmiControlEnabled correctly when
HdmiControlService is initialized.

Test: make && atest com.android.server.hdmi
Flag: EXEMPT bugfix
Bug: 379907271
Change-Id: Id0b14372fcdc743cce96140f4a7d1cd774ea6af7
1 file changed