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Fix illegal volume value issue
Ignore volume change if the value reported
in <Report Audio Status> as "reserved value (0x65<=N<=0x7E)"
or "status is unknown (0x7F)" (HDMI spec.).
When TV device receives <Report Audio Status>
as volume:0x7F (more than 0x64), HdmiControlService
notify the status to audio manager as "unknown volume"
without "FLAG_SHOW_UII"
Test: Connect old AVR to TV device, then press Play button of AVR.
Should not show the volume UI.
Change-Id: Icc4cfff5cfb46d075b45258210109c975a85c1d1