Claude review: drm/panel: sharp-ls043t1le01: make use of prepare_prev_first

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

Patch Review

**Correctness:** The `prepare()` callback at line 102 calls `sharp_nt_panel_init()` which issues DSI commands (`mipi_dsi_dcs_exit_sleep_mode_multi`, `mipi_dsi_dcs_write_seq_multi`, etc.), and then `sharp_nt_panel_on()` which calls `mipi_dsi_dcs_set_display_on_multi`. All of these require an active DSI link. Setting `prepare_prev_first` is the correct fix.

**Placement:** The assignment:
```c
sharp_nt->base.prepare_prev_first = true;
```
is placed right after `drm_panel_init()` and before `drm_panel_of_backlight()`, which matches the pattern used across dozens of other panel drivers (e.g., `panel-boe-bf060y8m-aj0.c:353`, `panel-boe-tv101wum-nl6.c:1721`, etc.).

**Fixes tag:** Correctly references 9e15123eca79 which introduced the regression by stopping unconditional DSI host power-up.

**No issues found.** Clean, minimal, correct fix.

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