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>

arch/powerpc/cpu/mpc83xx/Kconfig

@@ -49,6 +49,7 @@ config TARGET_MPC837XERDB
 
 config TARGET_IDS8313
 	bool "Support ids8313"
+	select DM
 
 config TARGET_KM8360
 	bool "Support km8360"

configs/ids8313_defconfig

@@ -4,4 +4,3 @@ CONFIG_MPC83xx=y
 CONFIG_FIT=y
 CONFIG_FIT_SIGNATURE=y
 CONFIG_TARGET_IDS8313=y
-CONFIG_DM=y