ARM: mx6: 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/Kconfig b/arch/arm/Kconfig
index 588e5ee..a6d2a41 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -546,11 +546,15 @@
 config TARGET_MX6QSABREAUTO
 	bool "Support mx6qsabreauto"
 	select CPU_V7
+	select DM
+	select DM_THERMAL
 
 config TARGET_MX6SABRESD
 	bool "Support mx6sabresd"
 	select CPU_V7
 	select SUPPORT_SPL
+	select DM
+	select DM_THERMAL
 
 config TARGET_MX6SLEVK
 	bool "Support mx6slevk"
@@ -560,6 +564,8 @@
 	bool "Support mx6sxsabresd"
 	select CPU_V7
 	select SUPPORT_SPL
+	select DM
+	select DM_THERMAL
 
 config TARGET_GW_VENTANA
 	bool "Support gw_ventana"