net/ice: Fix boolean assignment

vbool in ice_devlink_enable_roce_get can be assigned to a
non-0/1 constant.

Fix this assignment of vbool to be 0/1.

Fixes: e523af4e ("net/ice: Add support for enable_iwarp and enable_roce devlink param")
Suggested-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>