MDBF-1135 update ppc64le-raptor worker lock count

Covering two aspects:
[1] locks were not honored due to bad naming
[2] supporting 6 builds in parallel is too much for a 16 proc machine

9 builds were found in parallel, none of which in Acquiring locks status.
```
$ hostname && nproc && cat /proc/meminfo | grep MemTotal  && uptime
us-raptor-bbw1-p9
16
MemTotal:       66525184 kB
 06:53:48 up 13 days, 23:00,  1 user,  load average: 41.00, 49.87, 57.93

$ docker ps | wc -l
9
```

Adjusting locks to 3 is more realistic given that every builder requests 7 jobs. Accounting for the average where sometimes just 1 core is used during package build.

Author: RazvanLiviuVarzaru

worker_locks.yaml

@@ -14,7 +14,7 @@ amd-bbw2-docker: 6
 intel-bbw1-docker: 5
 ppc64le-rhel8-docker: 6
 ppc64le-db-docker: 8
-ppc64le-raptor-docker: 6
+ppc64le-raptor-bbw1-docker: 3
 aarch64-bbw1-docker: 2
 aarch64-bbw2-docker: 2
 aarch64-bbw3-docker: 2