Pass intel_display to the encoder suspend/shutdown helpers instead of
drm_i915_private for better isolation.

v2: Pass intel_display to HAS_DISPLAY() as well, update commit log
    accordingly. (Jani)

Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> # v1
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240618125255.4080303-2-imre.deak@intel.com