drm: edid: add support for parsing additional EDID blocks

Currently the DRM upstream EDID parser doesn't have support to
parse all EDID blocks such as extension tag blocks.

Add support for parsing these blocks and extract necessary info.

Change-Id: Iae92de79960f6f0e73a8e2ff7944c1bf101d90a6
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>