sfc: use flow_rule_is_supp_control_flags()

Change the check for unsupported control flags, to use the new helper
flow_rule_is_supp_control_flags().

Since the helper was based on sfc, then nothing really changes.

Compile-tested, and compiled objects are identical.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
Reviewed-by: Edward Cree <ecree.xilinx@gmail.com>
Link: https://lore.kernel.org/r/20240417140712.100905-1-ast@fiberby.net


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