watchdog: ast2600: add AST2700 support

The AST2700 reuses the AST2600 watchdog block unchanged. Bind the
driver to the aspeed,ast2700-wdt compatible and enable WDT_AST2600
on the AST2700.

Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
Reviewed-by: Stefan Roese <stefan.roese@mailbox.org>

drivers/watchdog/Kconfig

@@ -130,11 +130,11 @@ config WDT_ASPEED
 	  Second Boot.
 
 config WDT_AST2600
-	bool "Aspeed AST2600 watchdog timer support"
-	depends on WDT && ASPEED_AST2600
+	bool "Aspeed AST2600/AST2700 watchdog timer support"
+	depends on WDT && (ASPEED_AST2600 || ASPEED_AST2700)
 	default y
 	help
-	  Select this to enable watchdog timer for Aspeed ast2500/ast2400 devices.
+	  Select this to enable watchdog timer for Aspeed ast2600/ast2700 devices.
 	  The watchdog timer is stopped when initialized. It performs reset, either
 	  full SoC reset or CPU or just some peripherals, based on the flags.
 

drivers/watchdog/ast2600_wdt.c

@@ -87,6 +87,7 @@ static const struct wdt_ops ast2600_wdt_ops = {
 
 static const struct udevice_id ast2600_wdt_ids[] = {
 	{ .compatible = "aspeed,ast2600-wdt" },
+	{ .compatible = "aspeed,ast2700-wdt" },
 	{ }
 };