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/popmetal-rk3288_defconfig b/configs/popmetal-rk3288_defconfig
index ee108f3..4a63e7a 100644
--- a/configs/popmetal-rk3288_defconfig
+++ b/configs/popmetal-rk3288_defconfig
@@ -24,6 +24,8 @@
 CONFIG_CMD_PMIC=y
 CONFIG_CMD_REGULATOR=y
 # CONFIG_SPL_DOS_PARTITION is not set
+CONFIG_ISO_PARTITION=y
+# CONFIG_SPL_ISO_PARTITION is not set
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_OF_SPL_REMOVE_PROPS="pinctrl-0 pinctrl-names clock-names interrupt-parent assigned-clocks assigned-clock-rates assigned-clock-parents"
 CONFIG_REGMAP=y