ARM: UniPhier: move support card select to Kconfig

There are two kinds of expansion boards which are often used for
the UniPhier platform and they are only exclusively selectable.
It can be better described by the "choice" menu of Kconfig.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/configs/ph1_pro4_defconfig b/configs/ph1_pro4_defconfig
index f4ddf5f..7ea4e6e 100644
--- a/configs/ph1_pro4_defconfig
+++ b/configs/ph1_pro4_defconfig
@@ -4,6 +4,7 @@
 +S:CONFIG_ARM=y
 +S:CONFIG_ARCH_UNIPHIER=y
 +S:CONFIG_MACH_PH1_PRO4=y
++S:CONFIG_DCC_MICRO_SUPPORT_CARD=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BDI=y
 CONFIG_CMD_CONSOLE=y