Revert "net/rds: use different workqueue for base_conn"

Revert "net/rds: use different workqueue for base_conn"

This reverts commit ad7312bb8b8e ("net/rds: use different workqueue for
base_conn"). The RDS path record caching will be replaced by ibacm. Thus,
all the TOS connections do not rely on its base connection to perform SA
query.  As a result, RDS does not need a separate "priority" workqueue for
the base connection.

Orabug: 26497333

Signed-off-by: Wei Lin Guay <wei.lin.guay@oracle.com>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Avinash Repaka <avinash.repaka@oracle.com>
Reviewed-by: Ajaykumar Hotchandani <ajaykumar.hotchandani@oracle.com>