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/vexpress_aemv8a_juno_defconfig b/configs/vexpress_aemv8a_juno_defconfig
index ae0a691..f9a2467 100644
--- a/configs/vexpress_aemv8a_juno_defconfig
+++ b/configs/vexpress_aemv8a_juno_defconfig
@@ -22,6 +22,7 @@
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_CACHE=y
 # CONFIG_CMD_MISC is not set
+# CONFIG_ISO_PARTITION is not set
 CONFIG_DM=y
 CONFIG_DM_SERIAL=y
 CONFIG_OF_LIBFDT=y