drm/panel: novatek-nt36672a: 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 Qualcomm boards. The Qualcomm 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]

Cc: Sumit Semwal <[email protected]>
Cc: Benni Steini <[email protected]>
Cc: Marijn Suijten <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Tested-by: Joel Selvaraj <[email protected]>
Signed-off-by: Douglas Anderson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/20240503143327.RFT.v2.19.I67819ba5513d4ef85f254a68b22a3402b4cdf30f@changeid

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