Claude review: platform/surface: SAM: Add support for Surface Pro 12in

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

Patch Review

Adds a SAM node group and OF match entry for the Surface Pro 12in:

```c
+static const struct software_node *ssam_node_group_sp12in[] = {
+	&ssam_node_root,
+	&ssam_node_hub_kip,
+	&ssam_node_tmp_sensors,
+	&ssam_node_hid_kip_keyboard,
+	&ssam_node_hid_sam_penstash,
+	&ssam_node_hid_kip_touchpad,
+	&ssam_node_hid_kip_fwupd,
+	&ssam_node_pos_tablet_switch,
+	NULL,
+};
```

The commit message explains the deliberate omission of battery and charger info nodes to avoid conflicts with other drivers. The node group is similar to SP11 (`ssam_node_group_sp11`) but without battery-related nodes.

The OF match entry correctly uses the compatible from the DTS:

```c
+	{ .compatible = "microsoft,surface-pro-12in", (void *)ssam_node_group_sp12in },
```

**Minor nit:** The comment says `/* Surface Pro 12in First Edition (ARM/QCOM) */` while other entries use shorter names like `/* Surface Pro 11 (ARM/QCOM) */`. Consistent, but "First Edition" is a bit verbose for a comment. Not blocking.

**No functional issues.**

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