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/vct_platinumavc_onenand_defconfig b/configs/vct_platinumavc_onenand_defconfig
index ee3b400..d690e19 100644
--- a/configs/vct_platinumavc_onenand_defconfig
+++ b/configs/vct_platinumavc_onenand_defconfig
@@ -13,4 +13,5 @@
 CONFIG_CMD_DHCP=y
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_UBI=y
+# CONFIG_ISO_PARTITION is not set
 CONFIG_SYS_NS16550=y