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/A33-OLinuXino_defconfig b/configs/A33-OLinuXino_defconfig
index 1e0a18f..17cd7c5 100644
--- a/configs/A33-OLinuXino_defconfig
+++ b/configs/A33-OLinuXino_defconfig
@@ -20,5 +20,6 @@
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_FPGA is not set
 # CONFIG_SPL_DOS_PARTITION is not set
+# CONFIG_SPL_ISO_PARTITION is not set
 CONFIG_AXP_DCDC1_VOLT=3300
 CONFIG_USB_MUSB_HOST=y