um: vector: adjust to coalesce API changes

The API changes were propagated to most drivers, but clearly
arch/um/drivers/ was missed, perhaps due to looking only at
the drivers/ folder. Fix that.

Fixes: f3ccfda1 ("ethtool: extend coalesce setting uAPI with CQE mode")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20210827094759.f3ab06684bd0.I985181cc00fe017cfe6413d9e1bb720cbe852e6d@changeid


Signed-off-by: Jakub Kicinski <kuba@kernel.org>