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_ld20_defconfig b/configs/uniphier_ld20_defconfig
index 272304f..4c522b9 100644
--- a/configs/uniphier_ld20_defconfig
+++ b/configs/uniphier_ld20_defconfig
@@ -23,6 +23,7 @@
 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_SPL_OF_TRANSLATE=y
 CONFIG_GPIO_UNIPHIER=y