dm: SMEM (Shared memory) uclass

This is a uclass for Shared memory manager drivers.

A Shared Memory Manager driver implements an interface for allocating
and accessing items in the memory area shared among all of the
processors.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>

Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/drivers/smem/Kconfig b/drivers/smem/Kconfig
new file mode 100644
index 0000000..64337a8
--- /dev/null
+++ b/drivers/smem/Kconfig
@@ -0,0 +1,2 @@
+menuconfig SMEM
+	bool  "SMEM (Shared Memory mamanger) support"