disk: convert CONFIG_PARTITIONS to Kconfig

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay73@gmail.com>
diff --git a/Kconfig b/Kconfig
index cb19ce6..ff34fa1 100644
--- a/Kconfig
+++ b/Kconfig
@@ -311,6 +311,8 @@
 
 source "cmd/Kconfig"
 
+source "disk/Kconfig"
+
 source "dts/Kconfig"
 
 source "net/Kconfig"