This patch fixes an outright bug in tcDataKindSig, shown up in Trac
of a data type declaration.  See Note [TyConBinders for the result kind
signature of a data type]

I also took the opportunity to elminate the DataKindCheck argument
and data type from tcDataKindSig, instead moving the check to the
call site, which is easier to understand.

(cherry picked from commit 68149452)