MLK-20965: watchdog: imx8_wdt: remove watchdog action set

The default watchdog action is partition reset now, so no need kernel
to take care. Besides, scfw full test case may set other watchdog
action but kernel may set it back later to default partition reset
which scfw wouldn't expect, so avoid touching watchdog action.
Please modify scfw code in case changing watchdog action to board
reset.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reviewed-by: Anson Huang <anson.huang@nxp.com>

drivers/watchdog/imx8_wdt.c

@@ -72,10 +72,8 @@ static int imx8_wdt_start(struct watchdog_device *wdog)
 			&res);
 	if (res.a0)
 		return res.a0;
-	/* TODO: change to SC_TIMER_WDOG_ACTION_PARTITION after SCFW support */
-	arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_SET_WDOG_ACT,
-			SC_TIMER_WDOG_ACTION_PARTITION, 0, 0, 0, 0, 0, &res);
-	return res.a0;
+
+	return 0;
 }
 
 static int imx8_wdt_stop(struct watchdog_device *wdog)