drm/panel: xinpeng-xpp055c272: Don't call unprepare+disable at shutdown/remove

It's the responsibility of a correctly written DRM modeset driver to
call drm_atomic_helper_shutdown() at shutdown time and that should be
disabling / unpreparing the panel if needed. Panel drivers shouldn't
be calling these functions themselves.

A recent effort was made to fix as many DRM modeset drivers as
possible [1] [2] [3] and most drivers are fixed now.

A grep through mainline for compatible strings used by this driver
indicates that it is used by Rockchip boards. The Rockchip driver
appears to be correctly calling drm_atomic_helper_shutdown() so we can
remove the calls.

[1] https://lore.kernel.org/r/[email protected]
[2] https://lore.kernel.org/r/[email protected]
[3] https://lore.kernel.org/r/[email protected]

Acked-by: Linus Walleij <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Reviewed-by: Heiko Stuebner <[email protected]>
Signed-off-by: Douglas Anderson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/20240503143327.RFT.v2.31.Ib97e67a9877070698afbec4f8ede091b2bf89a1f@changeid

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