coll/accelerator: update owner file

owner file update to indicate that the component is active and ownership
is shared between NVidia and AMD.

Signed-off-by: Edgar Gabriel <Edgar.Gabriel@amd.com>

ompi/mca/coll/accelerator/owner.txt

@@ -3,5 +3,5 @@
 # owner: institution that is responsible for this package
 # status: e.g. active, maintenance, unmaintained
 #
-owner: NVIDIA
-status: maintenance
+owner: NVIDIA/AMD
+status: active