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/salvator-x_defconfig b/configs/salvator-x_defconfig
index bf8f7c7..d1f53db 100644
--- a/configs/salvator-x_defconfig
+++ b/configs/salvator-x_defconfig
@@ -12,3 +12,4 @@
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_XIMG is not set
+CONFIG_DOS_PARTITION=y