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/acadia_defconfig b/configs/acadia_defconfig
index 7f33a8f..d4a9588 100644
--- a/configs/acadia_defconfig
+++ b/configs/acadia_defconfig
@@ -17,6 +17,7 @@
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
 CONFIG_MAC_PARTITION=y
+CONFIG_ISO_PARTITION=y
 # CONFIG_PCI is not set
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y