Claude review: drm/msm/hdmi: Use the common TMDS char rate constants in 8996 PHY

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

Patch Review

Replaces `HDMI_PCLK_MAX_FREQ` (600000000) and `HDMI_PCLK_MIN_FREQ` (25000000) with `HDMI_2_0_TMDS_CHAR_RATE_MAX_HZ` and `HDMI_TMDS_CHAR_RATE_MIN_HZ`:

```c
-	req->rate = clamp_t(unsigned long, req->rate, HDMI_PCLK_MIN_FREQ, HDMI_PCLK_MAX_FREQ);
+	req->rate = clamp_t(unsigned long, req->rate, HDMI_TMDS_CHAR_RATE_MIN_HZ,
+			    HDMI_2_0_TMDS_CHAR_RATE_MAX_HZ);
```

**Minor semantic note:** The old defines used "PCLK" (pixel clock) terminology, and the new ones use "TMDS character rate". These are equivalent at 8bpc without pixel repetition, and since this is a PLL providing the TMDS clock the new naming is arguably more precise. The values are identical either way.

No issues. **Reviewed-by tag:** Dmitry Baryshkov.

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