disk: convert CONFIG_ISO_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/inka4x0_defconfig b/configs/inka4x0_defconfig
index 6fa1150..15383a2 100644
--- a/configs/inka4x0_defconfig
+++ b/configs/inka4x0_defconfig
@@ -12,5 +12,6 @@
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_MAC_PARTITION=y
+CONFIG_ISO_PARTITION=y
 CONFIG_USB=y
 CONFIG_USB_STORAGE=y