msm: adv7533: add support for clients to read audio block

Add support to read audio and speaker block from sink EDID
data, so that clients like audio driver who are registered
to adv chip can get the audio data and parse it accordingly.

Change-Id: Ia603044069fb4ae651a4df6faaa4ca61e6377276
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>