RDS: IB: drop workaround for loopback connection hangs

RDS: IB: drop workaround for loopback connection hangs

There is no need to modify the ARP cache directly under the
assumption that it helps to speed up the failover/failback for
loopback connections. The ARP cache is properly updated by core
IPv4 code and one of the issue with RDS active bonding code
with arp has been addressed as part of
'commit 42a7becc725f ("RDS: IB: Make use of ARPOP_REQUEST instead
of ARPOP_REPLY in bonding code")'. Remove the workaround added as
part of bug 16979994 with patch "RDS: Local address resolution may
be delayed after IP has moved"

Orabug: 22347191

Tested-by: Michael Nowak <michael.nowak@oracle.com>
Tested-by: Rafael Alejandro Peralez <rafael.peralez@oracle.com>
Tested-by: Liwen Huang <liwen.huang@oracle.com>
Tested-by: Hong Liu <hong.x.liu@oracle.com>
Reviewed-by: Mukesh Kacker <mukesh.kacker@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>