HDMI: Temporary qcom HDMI fixes

Since we still don't have a user-controllable Setting to enable HDMI,
enable it by default.
Also, for devices with trouble matching the HDMI clocks in the receivers,
add the possibility of letting the controller choose the resolution
on its own with the build-time TARGET_QCOM_HDMI_RESOLUTION_AUTO flag

Change-Id: I3ca0639e9f644872a3585f04f2cf8180d8451f2c