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/pic32mzdask_defconfig b/configs/pic32mzdask_defconfig
index 852eb0a..bb6ed00 100644
--- a/configs/pic32mzdask_defconfig
+++ b/configs/pic32mzdask_defconfig
@@ -21,6 +21,7 @@
 CONFIG_CMD_RARP=y
 CONFIG_CMD_TIME=y
 CONFIG_CMD_EXT4_WRITE=y
+# CONFIG_ISO_PARTITION is not set
 CONFIG_OF_EMBED=y
 CONFIG_NET_RANDOM_ETHADDR=y
 # CONFIG_BLK is not set