watchdog: add support for MediaTek MT7621 SoC

This patch makes mt7621_wdt driver available for MediaTek MT7621 SoC

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

drivers/watchdog/Kconfig

@@ -191,7 +191,7 @@ config WDT_MT7620
 
 config WDT_MT7621
 	bool "MediaTek MT7621 watchdog timer support"
-	depends on WDT && SOC_MT7628
+	depends on WDT && (SOC_MT7621 || SOC_MT7628)
 	help
 	  Select this to enable Ralink / Mediatek watchdog timer,
 	  which can be found on some MediaTek chips.