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/arches_defconfig b/configs/arches_defconfig
index c35af0f..d8f79f7 100644
--- a/configs/arches_defconfig
+++ b/configs/arches_defconfig
@@ -20,5 +20,6 @@
 CONFIG_CMD_CACHE=y
 CONFIG_MAC_PARTITION=y
 CONFIG_DOS_PARTITION=y
+CONFIG_ISO_PARTITION=y
 CONFIG_OF_CONTROL=y
 CONFIG_SYS_NS16550=y