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/Mele_M9_defconfig b/configs/Mele_M9_defconfig
index de2b859..5289a98 100644
--- a/configs/Mele_M9_defconfig
+++ b/configs/Mele_M9_defconfig
@@ -12,6 +12,7 @@
 # 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_ETH_DESIGNWARE=y
 CONFIG_AXP_DCDC1_VOLT=3300
 CONFIG_AXP_ALDO1_VOLT=3300