Claude review: clk: qcom: gdsc: Add custom disable callback for GX GDSC

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

Patch Review

**Author:** Jagadeesh Kona

This patch adds `gdsc_gx_disable()` which mirrors the existing `gdsc_gx_do_nothing_enable()` pattern. The logic is:
- If `synced_poweroff` is set (recovery), allow the real `gdsc_disable()` path.
- Otherwise, only disable the regulator supply and skip HW toggling.

```c
+int gdsc_gx_disable(struct generic_pm_domain *domain)
+{
+	struct gdsc *sc = domain_to_gdsc(domain);
+
+	if (domain->synced_poweroff)
+		return gdsc_disable(domain);
+
+	/* Remove parent-supply placed in enable */
+	if (sc->rsupply)
+		return regulator_disable(sc->rsupply);
+
+	return 0;
+}
```

This looks correct and symmetric with `gdsc_gx_do_nothing_enable()`, which does `regulator_enable(sc->rsupply)`. The `synced_poweroff` flag is a clean GenPD mechanism for communicating the recovery intent.

No issues found.

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