Claude review: drm/panel: ilitek-ili9882t: use gpiod_set_value_cansleep()

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

**Correctness: Good.** All 7 replacements are in functions that are clearly in process/sleepable context:

- `ili9882t_unprepare()` — called from DRM panel unblanking path in process context; surrounding code calls `usleep_range()` and `regulator_disable()`.
- `ili9882t_prepare()` — same; surrounding code calls `usleep_range()`, `msleep()`, `regulator_enable()`, and `mipi_dsi_dcs_nop()`.
- `ili9882t_add()` — called from `probe` path, which is always process context.

**Commit message:** Clear and accurate. The rationale ("to allow use of this driver with GPIO controllers that might sleep") is the standard justification for this class of change.

**Completeness:** The patch covers every `gpiod_set_value()` call in the file — no instances are missed.

**Reviewed-by worthy:** Yes. This is a routine, low-risk correctness improvement with no functional change for GPIO controllers that don't sleep, and enables the driver to work correctly with those that do.

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