ARM: UniPhier: use "select" instead of default value in defconfig

All the UniPhier boards have switch to Driver Model.
"select DM" is better than default value in each defconfig.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index afd770c..1c90d17 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -761,6 +761,9 @@
 	select SUPPORT_SPL
 	select SPL
 	select OF_CONTROL
+	select DM
+	select DM_SERIAL
+	select DM_I2C
 
 endchoice
 
diff --git a/configs/ph1_ld4_defconfig b/configs/ph1_ld4_defconfig
index aa1805b..036e2d1 100644
--- a/configs/ph1_ld4_defconfig
+++ b/configs/ph1_ld4_defconfig
@@ -1,9 +1,6 @@
 CONFIG_ARM=y
 CONFIG_ARCH_UNIPHIER=y
-CONFIG_DM=y
-CONFIG_DM_SERIAL=y
 CONFIG_SPL_DM=y
-CONFIG_DM_I2C=y
 CONFIG_MACH_PH1_LD4=y
 CONFIG_PFC_MICRO_SUPPORT_CARD=y
 CONFIG_DEFAULT_DEVICE_TREE="uniphier-ph1-ld4-ref"
diff --git a/configs/ph1_pro4_defconfig b/configs/ph1_pro4_defconfig
index 194f7a5..9a010ee 100644
--- a/configs/ph1_pro4_defconfig
+++ b/configs/ph1_pro4_defconfig
@@ -1,9 +1,6 @@
 CONFIG_ARM=y
 CONFIG_ARCH_UNIPHIER=y
-CONFIG_DM=y
-CONFIG_DM_SERIAL=y
 CONFIG_SPL_DM=y
-CONFIG_DM_I2C=y
 CONFIG_MACH_PH1_PRO4=y
 CONFIG_PFC_MICRO_SUPPORT_CARD=y
 CONFIG_DEFAULT_DEVICE_TREE="uniphier-ph1-pro4-ref"
diff --git a/configs/ph1_sld8_defconfig b/configs/ph1_sld8_defconfig
index e7e7fff..29fe0e8 100644
--- a/configs/ph1_sld8_defconfig
+++ b/configs/ph1_sld8_defconfig
@@ -1,9 +1,6 @@
 CONFIG_ARM=y
 CONFIG_ARCH_UNIPHIER=y
-CONFIG_DM=y
-CONFIG_DM_SERIAL=y
 CONFIG_SPL_DM=y
-CONFIG_DM_I2C=y
 CONFIG_MACH_PH1_SLD8=y
 CONFIG_PFC_MICRO_SUPPORT_CARD=y
 CONFIG_DEFAULT_DEVICE_TREE="uniphier-ph1-sld8-ref"