Claude review: drm/amd/display: Add pixel_clock to amd_pp_display_configuration

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

Patch Review

Clean, minimal patch. Adds the `pixel_clock` field to two structs and wires up the data flow.

The rename of `sym_clock` to `pixel_clock` in `dm_services_types.h`:
```c
-	uint32_t sym_clock; /* HDMI only */
+	uint32_t pixel_clock; /* Pixel clock in KHz (for HDMI only: normalized) */
```
is correct and matches the upstream commit. The old field name was misleading since "sym_clock" typically refers to the DisplayPort symbol clock.

The addition of `pixel_clock` to `single_display_configuration` in `dm_pp_interface.h`:
```c
+	uint32_t pixel_clock; /* Pixel clock in KHz (for HDMI only: normalized) */
```
and the corresponding propagation in `amdgpu_dm_pp_smu.c`:
```c
+			adev->pm.pm_display_cfg.displays[i].pixel_clock = dc_cfg->pixel_clock;
```
and the assignment in `dce110_clk_mgr.c`:
```c
-		cfg->sym_clock = stream->phy_pix_clk;
+		cfg->pixel_clock = stream->phy_pix_clk;
```
are all straightforward.

No issues with this patch.

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