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/bamboo_defconfig b/configs/bamboo_defconfig
index a76c86d..2212b04 100644
--- a/configs/bamboo_defconfig
+++ b/configs/bamboo_defconfig
@@ -21,6 +21,7 @@
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_MAC_PARTITION=y
+CONFIG_ISO_PARTITION=y
 # CONFIG_PCI_PNP is not set
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y