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/lwmon5_defconfig b/configs/lwmon5_defconfig
index 0cab98f..4584258 100644
--- a/configs/lwmon5_defconfig
+++ b/configs/lwmon5_defconfig
@@ -23,6 +23,7 @@
 CONFIG_CMD_PING=y
 CONFIG_CMD_FAT=y
 CONFIG_MAC_PARTITION=y
+CONFIG_ISO_PARTITION=y
 # CONFIG_PCI is not set
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y