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/PIP405_defconfig b/configs/PIP405_defconfig
index 873d00a3f4..0a7746e 100644
--- a/configs/PIP405_defconfig
+++ b/configs/PIP405_defconfig
@@ -21,6 +21,7 @@
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_FAT=y
 CONFIG_MAC_PARTITION=y
+CONFIG_ISO_PARTITION=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
 CONFIG_USB_STORAGE=y