net/dpaa2: fix Rx offload flags on jumbo MTU set

net/dpaa2: fix Rx offload flags on jumbo MTU set

The JUMBO frame handling in dpaa2_dev_mtu_set api was not correct.
When frame_size is greater than RTE_ETHER_MAX_LEN, the
intention is to add JUMBO flag in rx offload while it was resetting
all other flags other than JUMBO as AND operator was used instead of OR.

Fixes: 0ebce6129bc6 ("net/dpaa2: support new ethdev offload APIs")
Cc: stable@dpdk.org
Signed-off-by: Sachin Saxena <sachin.saxena@nxp.com>
Reviewed-by: Gagandeep Singh <g.singh@nxp.com>