commit 56a2b7f2a39a8d4b16a628e113decde3d7400879 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: NDaniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: NTested-by: Paul Wise <pabs3@bonedaddy.net>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190607110513.12072-1-jani.nikula@intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>