Claude review: drm/panel/boe-tv101wum-nl6: set MIPI_DSI_MODE_LPM after sending panel disable cmds

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

Patch Review

**Correctness: Good.** The change is straightforward and correct:

```c
boe->dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;   // line 1322: clear LPM (switch to HS)

mipi_dsi_dcs_set_display_off_multi(&ctx);        // line 1324: send disable in HS
mipi_dsi_dcs_enter_sleep_mode_multi(&ctx);        // line 1325: send sleep in HS

mipi_dsi_msleep(&ctx, 150);                      // line 1327: wait for panel

boe->dsi->mode_flags |= MIPI_DSI_MODE_LPM;      // line 1329: restore LPM  <-- NEW
```

The flag is restored with `|=` rather than `=`, which is correct — it only sets the `MIPI_DSI_MODE_LPM` bit without disturbing other flags. Since only `MIPI_DSI_MODE_LPM` was cleared earlier (line 1322), this perfectly reverses the earlier modification.

**Pattern consistency:** The clear-before/restore-after pattern is used in other panel drivers (e.g., `panel-asus-z00t-tm5p5-n35596.c` lines 174/180). Interestingly, some other panel drivers like `panel-ebbg-ft8719.c` and `panel-boe-td4320.c` do NOT restore LPM after their off sequence, so this is not universally consistent — but restoring it is clearly the safer approach and matches the initial state set at probe time (`dsi->mode_flags = desc->mode_flags` at line 1758, where all descriptors include `MIPI_DSI_MODE_LPM`).

**Placement:** Restoring LPM after the `mipi_dsi_msleep()` is the right choice — all DSI commands have been fully sent before the flag is changed back.

**Impact scope:** This driver covers multiple panel variants (BOE TV101WUM-NL6, TV105WUM-NW0, AUO KD101N80-45NA, etc.). The `boe_panel_disable()` function is shared across all of them, so this fix applies to all. The submitter tested on krane sku176; other devices should also benefit since the asymmetry was a latent bug.

**Nits:**
- **Missing `Fixes:` tag.** This would be very helpful for stable tree backport consideration. It should reference either the Mediatek HS mode commit that exposed this, or the original commit that introduced the `mode_flags &= ~MIPI_DSI_MODE_LPM` without a corresponding restore.
- **Commit subject line** is a bit long (76 chars after the prefix). Minor — well within tolerance.

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