ipv4: raw: remove useless input parameter in do_raw_set/getsockopt

The input parameter 'level' in do_raw_set/getsockopt() is not used.
Therefore, remove it.

Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240228072505.640550-1-shaozhengchao@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>