drm/edid: move displayid tiled block parsing into separate function.

This just makes the code easier to follow.

Change-Id: I96b57a9d895fadc9e351ad56824e6c477496a918
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Git-commit: 5e546cd5b3bc76824069ffa98c52a5f48cf91aba
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>