drm: move edid property update and add modes out of edid firmware loader

Make the firmware loader more generic and generally useful.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1487344854-18777-2-git-send-email-jani.nikula@intel.com
Git-commit: 07c2b84b9956dd5d0871d47f5f0bbf9388d2d83f
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Change-Id: I918426a1ef7b11cfea95827b89eec821d1f4a95a
Signed-off-by: Tanmay Shah <tanmay@codeaurora.org>