drm_edid: Add a function to get EDID base block

It's found that some panels have variants that they share the same panel id
although their EDID and names are different. Besides panel id, now we need
more information from the EDID base block to distinguish these panel
variants.

Add drm_edid_read_base_block() to return the EDID base block, which is
wrapped in struct drm_edid.

Caller can further use it to get panel id or check if the block contains
certain strings, such as panel name.

Merge drm_edid_get_panel_id() and edid_extract_panel_id() into one
function.

Signed-off-by: Hsin-Yi Wang <[email protected]>
Reviewed-by: Douglas Anderson <[email protected]>
Reviewed-by: Jani Nikula <[email protected]>
Signed-off-by: Douglas Anderson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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