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/ap143_defconfig b/configs/ap143_defconfig
index d087c19..ed886b2 100644
--- a/configs/ap143_defconfig
+++ b/configs/ap143_defconfig
@@ -22,6 +22,7 @@
 # CONFIG_CMD_FPGA is not set
 # CONFIG_CMD_NET is not set
 # CONFIG_CMD_NFS is not set
+# CONFIG_ISO_PARTITION is not set
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_BAR=y