wifi: iwlwifi: give Sc devices their own family

They're not the same as Bz or any prior ones, and there's
already one place in the driver that would erroneously
assign a workaround to A-step Sc devices if they're just
treated as a version of Bz. Fix that.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230621130443.e98272ddb808.If18577b2393f631d1bfaa931287cae106fa32438@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>