Revert "RDS: base connection dependency needed for rolling downgrade from version...

Revert "RDS: base connection dependency needed for rolling downgrade from version 4.1 to 3.1""

This commit partially revert commit 5e86bae96237 ("RDMA CM: Add reason code
for IB_CM_REJ_CONSUMER_DEFINED") as it contains two changes in a single
commit. The rolling downgrade support from 4.1 to 3.1 is no longer needed
because there is no practical use case for this feature. This commit removes
the base connection dependency for rolling downgrade, or changes the code
back to its original form before 5e86bae96237. The clean-up of the RDS
backward compatibility issue is not addresssed in this patch, and please
refer to bugdb #26772473 for more details.

Orabug: 26124147

Suggested-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Wei Lin Guay <wei.lin.guay@oracle.com>
Reviewed-by: Ajaykumar Hotchandani <ajaykumar.hotchandani@oracle.com>