drm/arm/hdlcd: Use drm_mode_config_helper_suspend/resume()
Replace driver's code with the generic helpers that do the same thing including the NULL check. Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Brian Starkey <brian.starkey@arm.com> Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
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