Claude review: phy: qualcomm: hdmi-28lpm: provide dynamic configuration

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

Patch Review

This patch replaces the fixed frequency lookup tables (the old `freqtbl[]` array with hardcoded register values for 8 specific pixel clocks) with runtime-calculated PLL configuration. This is a significant improvement as it enables arbitrary pixel clocks within the VCO range.

The PLL math looks reasonable:
```c
dc_offset = vco_freq / int_ref_freq - 1;
tmp = vco_freq % int_ref_freq;
tmp *= 0x10000;
sdm_freq_seed = div_u64(tmp, int_ref_freq);
```

**XXX comments**: There are two `XXX` comments left in the code:
```c
/* XXX: 19.2 for qcs404 */
unsigned long parent_rate = 27000000;
```
and:
```c
/* XXX: 0xc3 instead of 0x33 for qcs404 */
lf_cfg1 = dc_offset >= 30 ? 0x33 : ...
```
These are fine as markers for future QCS404 work, but should be tracked.

**Kconfig typo**: Line 5030 in the overall mbox: `"HDMI PHY presend on 32-bit platforms"` should be `"present"`. (This was actually introduced in patch 1, but worth flagging.)

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