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/kylin-rk3036_defconfig b/configs/kylin-rk3036_defconfig
index c53e422..6111e81 100644
--- a/configs/kylin-rk3036_defconfig
+++ b/configs/kylin-rk3036_defconfig
@@ -16,6 +16,8 @@
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_TIME=y
 # CONFIG_SPL_DOS_PARTITION is not set
+CONFIG_ISO_PARTITION=y
+# CONFIG_SPL_ISO_PARTITION is not set
 CONFIG_REGMAP=y
 CONFIG_SYSCON=y
 CONFIG_CLK=y