ARM: uniphier: disable CONFIG_SPL_DOS_PARTITION

The SPL for UniPhier platform does not recognize any partitions.
Do not compile unneeded features.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/uniphier_pro4_defconfig b/configs/uniphier_pro4_defconfig
index 36f9743..1a5e66d 100644
--- a/configs/uniphier_pro4_defconfig
+++ b/configs/uniphier_pro4_defconfig
@@ -26,6 +26,7 @@
 CONFIG_CMD_TIME=y
 # CONFIG_CMD_MISC is not set
 CONFIG_CMD_FAT=y
+# CONFIG_SPL_DOS_PARTITION is not set
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_GPIO_UNIPHIER=y
 CONFIG_MISC=y