ARM: snapper9260: 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/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 30c4e17..b660a5b 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -30,6 +30,9 @@
 config TARGET_SNAPPER9260
 	bool "Support snapper9260"
 	select CPU_ARM926EJS
+	select DM
+	select DM_SERIAL
+	select DM_GPIO
 
 config TARGET_AFEB9260
 	bool "Support afeb9260"
diff --git a/configs/snapper9260_defconfig b/configs/snapper9260_defconfig
index 576d9c5..5c8850a 100644
--- a/configs/snapper9260_defconfig
+++ b/configs/snapper9260_defconfig
@@ -2,6 +2,3 @@
 CONFIG_ARM=y
 CONFIG_ARCH_AT91=y
 CONFIG_TARGET_SNAPPER9260=y
-CONFIG_DM=y
-CONFIG_DM_GPIO=y
-CONFIG_DM_SERIAL=y
diff --git a/configs/snapper9g20_defconfig b/configs/snapper9g20_defconfig
index 07a2643..9270b8d 100644
--- a/configs/snapper9g20_defconfig
+++ b/configs/snapper9g20_defconfig
@@ -2,6 +2,3 @@
 CONFIG_ARM=y
 CONFIG_ARCH_AT91=y
 CONFIG_TARGET_SNAPPER9260=y
-CONFIG_DM=y
-CONFIG_DM_GPIO=y
-CONFIG_DM_SERIAL=y