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/A10s-OLinuXino-M_defconfig b/configs/A10s-OLinuXino-M_defconfig
index 7ed3a85..4ee64d7 100644
--- a/configs/A10s-OLinuXino-M_defconfig
+++ b/configs/A10s-OLinuXino-M_defconfig
@@ -15,5 +15,6 @@
 # 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_AXP152_POWER=y
 CONFIG_USB_EHCI_HCD=y