drm/edid: check basic audio support on CEA extension block

Tag code stored in bit7:5 for CTA block byte[3] is not the same as
CEA extension block definition. Only check CEA block has
basic audio support.

v3: update commit message.

Cc: [email protected]
Cc: Jani Nikula <[email protected]>
Cc: Shawn C Lee <[email protected]>
Cc: intel-gfx <[email protected]>
Signed-off-by: Cooper Chiou <[email protected]>
Signed-off-by: Lee Shawn C <[email protected]>
Fixes: e28ad544f462 ("drm/edid: parse CEA blocks embedded in DisplayID")
Reviewed-by: Jani Nikula <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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