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/pcm058_defconfig b/configs/pcm058_defconfig
index 6ae0efa..638c360 100644
--- a/configs/pcm058_defconfig
+++ b/configs/pcm058_defconfig
@@ -37,6 +37,7 @@
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_CMD_UBI=y
+CONFIG_ISO_PARTITION=y
 CONFIG_DM=y
 CONFIG_MTD=y
 CONFIG_SPI_FLASH=y