nds32: Support AG101P timer DM.

Support AG101P timer device tree flow.

Signed-off-by: rick <rick@andestech.com>
diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index e038523..356fa29 100644
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -74,4 +74,10 @@
 	  usually at least one of them exists. Either of them is supported
 	  in U-Boot.
 
+config AG101P_TIMER
+	bool "Ag101p timer support"
+	depends on TIMER
+	help
+	  Select this to enable a timer for Ag101p devices.
+
 endmenu