The field mask value is provided in network byte order and has to
be converted to host byte order before calculating pedit mask
first bit.

Fixes: 88f30bbc ("net/mlx5e: Bit sized fields rewrite support")
Signed-off-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>