Revert "[Flang] Update the fix of PR 80738 to cover generic interface inside modules (llvm#81087)"

This reverts commit 0802596.

See comments in PR llvm#81087 for a test case that shows why I'm reverting.

Author: psteinfeld

flang/lib/Semantics/resolve-names.cpp

@@ -5648,10 +5648,9 @@ void DeclarationVisitor::Post(const parser::ProcDecl &x) {
   const auto &name{std::get<parser::Name>(x.t)};
   const Symbol *procInterface{nullptr};
   if (interfaceName_) {
-    Symbol *ultimate{&interfaceName_->symbol->GetUltimate()};
-    procInterface = ultimate->has<GenericDetails>()
-        ? ultimate->get<GenericDetails>().specific()
-        : ultimate;
+    procInterface = interfaceName_->symbol->has<GenericDetails>()
+        ? interfaceName_->symbol->get<GenericDetails>().specific()
+        : interfaceName_->symbol;
   }
   auto attrs{HandleSaveName(name.source, GetAttrs())};
   DerivedTypeDetails *dtDetails{nullptr};