util: Make sure all util dirs have description files at top level

New util directories have been added with no description.md file.
The description file for supermicro was added at a secondary level,
which doesn't help a user find the util since no path was added. Move
it up to the top level.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: I40b4c25dd7706513e96c6b8078a34160f8bb901e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48961
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tom Hiller <thrilleratplay@gmail.com>

util/spd_tools/description.md

@@ -0,0 +1,11 @@
+Tools for generating SPD files for DDR4 memory used in platforms with
+memory down configuration.
+
+
+
+* _gen_spd.go_ - Generates de-duplicated SPD files using a
+                 global memory part list provided by the
+                 mainboard in JSON format. `Go`
+
+* _gen_part_id.go_ - Allocates DRAM strap IDs for different
+                     DDR4 memory parts used by the board. `Go`