nds32: Migrate CONFIG_DEBUG_LED to Kconfig

Move this value to the board Kconfig file.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/AndesTech/adp-ag101p/Kconfig b/board/AndesTech/adp-ag101p/Kconfig
index 5e8aa22..0fb7a10 100644
--- a/board/AndesTech/adp-ag101p/Kconfig
+++ b/board/AndesTech/adp-ag101p/Kconfig
@@ -1,5 +1,9 @@
 if TARGET_ADP_AG101P
 
+config DEBUG_LED
+	hex
+	default 0x902FFFFC
+
 config SYS_CPU
 	default "n1213"