powerpc: ids8313: use "select" instead of default value in defconfig

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/powerpc/cpu/mpc83xx/Kconfig b/arch/powerpc/cpu/mpc83xx/Kconfig
index 4d6cb09..88a3bd6 100644
--- a/arch/powerpc/cpu/mpc83xx/Kconfig
+++ b/arch/powerpc/cpu/mpc83xx/Kconfig
@@ -49,6 +49,7 @@
 
 config TARGET_IDS8313
 	bool "Support ids8313"
+	select DM
 
 config TARGET_KM8360
 	bool "Support km8360"