FROMLIST: drm/panel: samsung-atna33xc20: extend msleep in atana33xc20_disable to avoid glitch

samsung-atna40ct03 encounters glitch when powering off, extend msleep
in atana33xc20_disable to 40 can avoid this symptom.

Signed-off-by: Alvin1 Chen <alvin1.chen@lcfc.corp-partner.google.com>
(am from https://lore.kernel.org/all/20250122113144.1203705-1-alvin1.chen@lcfc.corp-partner.google.com/)

BUG=b:387940284
UPSTREAM-TASK=b:391527789
TEST=cros workon --board rauru start chromeos-kernel-6_6
emerge-rauru chromeos-kernel-6_6

Change-Id: If3711815728a39dc14cdce8fad8b26f9f06e5537
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/6189104


Reviewed-by: Yu-Che Cheng <giver@chromium.org>
Commit-Queue: Knox Chiou <knoxchiou@chromium.org>
Tested-by: Alvin1 Chen <alvin1.chen@lcfc.corp-partner.google.com>
Reviewed-by: Knox Chiou <knoxchiou@chromium.org>
Signed-off-by: Hubert Mazur <hmazur@google.com>