drm/edid: abstract override/firmware EDID retrieval
commit 56a2b7f2 upstream. Abstract the debugfs override and the firmware EDID retrieval function. We'll be needing it in the follow-up. No functional changes. Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Harish Chegondi <harish.chegondi@intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Tested-by: Tested-by: Paul Wise <pabs3@bonedaddy.net> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190607110513.12072-1-jani.nikula@intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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