disk: convert CONFIG_DOS_PARTITION to Kconfig

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay73@gmail.com>
diff --git a/configs/bg0900_defconfig b/configs/bg0900_defconfig
index f79b436..61968d0 100644
--- a/configs/bg0900_defconfig
+++ b/configs/bg0900_defconfig
@@ -22,6 +22,7 @@
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_CACHE=y
+CONFIG_DOS_PARTITION=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_BAR=y
 CONFIG_SPI_FLASH_STMICRO=y