clocksource/drivers/stm32-lptimer: Use wakeup capable instead of init wakeup

"wakeup-source" property describes a device which has wakeup capability
but should not force this device as a wakeup source.

Fixes: 48b41c5e2de6 ("clocksource: Add Low Power STM32 timers driver")
Cc: [e-mail]
Signed-off-by: Alexandre Torgue <[e-mail]>
Signed-off-by: Fabrice Gasnier <[e-mail]>
Rule: add
Link: https://lore.kernel.org/stable/20250306083407.2374894-1-fabrice.gasnier%40foss.st.com
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Daniel Lezcano <[e-mail]>

drivers/clocksource/timer-stm32-lp.c

···
 	}
 
 	if (of_property_read_bool(pdev->dev.parent->of_node, "wakeup-source")) {
-		ret = device_init_wakeup(&pdev->dev, true);
-		if (ret)
-			goto out_clk_disable;
+		device_set_wakeup_capable(&pdev->dev, true);
 
 		ret = dev_pm_set_wake_irq(&pdev->dev, irq);
 		if (ret)