manifest: update cmsis-nn to v6.0.0

Update cmsis-nn to version 6.0.0.
Revision history can be found at:
https://arm-software.github.io/CMSIS-NN/latest/rev_hist.html

Signed-off-by: Jordan Yates <jordan@embeint.com>

west.yml

@@ -124,7 +124,7 @@ manifest:
       revision: 6489e771e9c405f1763b52d64a3f17a1ec488ace
       path: modules/lib/cmsis-dsp
     - name: cmsis-nn
-      revision: 0c8669d81381ccf3b1a01d699f3b68b50134a99f
+      revision: ea987c1ca661be723de83bd159aed815d6cbd430
       path: modules/lib/cmsis-nn
     - name: edtt
       revision: 8d7b543d4d2f2be0f78481e4e1d8d73a88024803