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/inet9f_rev03_defconfig b/configs/inet9f_rev03_defconfig
index cb19fc2..63dd288 100644
--- a/configs/inet9f_rev03_defconfig
+++ b/configs/inet9f_rev03_defconfig
@@ -18,4 +18,5 @@
 # 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_USB_MUSB_HOST=y