Turn on HDMI-related logs conditionally for better debugging

This change will make debug messages from HDMI logger to be shown when
developers set log.tag.HDMI system property as DEBUG or VERBOSE. It will
allow much easier debugging for HDMI issues.

Bug: 27955073
Change-Id: If9ddd1150db6c647737190bc89a5534b3a173d66
1 file changed