nds32: Support AG101P serial DM.

Support AG101P serial device tree flow.

Signed-off-by: rick <rick@andestech.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index 2528f50..1212635 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -43,6 +43,7 @@
 
 config NDS32
 	bool "NDS32 architecture"
+	select SUPPORT_OF_CONTROL
 
 config NIOS2
 	bool "Nios II architecture"