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/boston64r2el_defconfig b/configs/boston64r2el_defconfig
index 33a2cfa..d620200 100644
--- a/configs/boston64r2el_defconfig
+++ b/configs/boston64r2el_defconfig
@@ -30,6 +30,7 @@
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
 # CONFIG_DOS_PARTITION is not set
+# CONFIG_ISO_PARTITION is not set
 CONFIG_OF_EMBED=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_CLK=y