dpaa2-eth: Fix Rx classification status

dpaa2-eth: Fix Rx classification status

BugLink: https://bugs.launchpad.net/bugs/1837517
[ Upstream commit df8e249be866e2f762be11b14a9e7a94752614d4 ]

Set the Rx flow classification enable flag only if key config
operation is successful.

Fixes 3f9b5c9 ("dpaa2-eth: Configure Rx flow classification key")

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>