e1000e: disable rxhash when try to enable jumbo frame also rxhash and rxcsum have...

e1000e: disable rxhash when try to enable jumbo frame also rxhash and rxcsum have enabled

commit ffd3d6 check if both rxhash and rxcsum enabled when enable jumbo
frames and disallowed all of them enabled at the same time.
Since jumbo frame widely be used in real world, and el5 did not supported
enable/disable rxhash, so we changed default behavior to disable rxhash
when try to enable jumbo frames also rxhash and rxcsum have enabled.

Signed-off-by: Joe Jin <joe.jin@oracle.com>
Signed-off-by: Guru Anbalagane <guru.anbalagane@oracle.com>
Acked-by: Adnan Misherfi <adnan.misherfi@oracle.com>