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/igep0020_defconfig b/configs/igep0020_defconfig
index 5fc0340..f1460fd 100644
--- a/configs/igep0020_defconfig
+++ b/configs/igep0020_defconfig
@@ -33,6 +33,7 @@
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_CMD_UBI=y
+CONFIG_ISO_PARTITION=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_LED_STATUS=y
 CONFIG_LED_STATUS_GPIO=y