[amg] Fix missing includes

dumux/linear/amgbackend.hh

@@ -31,6 +31,7 @@
 #include <dune/istl/paamg/pinfo.hh>
 #include <dune/istl/solvers.hh>
 
+#include <dumux/common/properties.hh>
 #include <dumux/linear/solver.hh>
 #include <dumux/linear/amgtraits.hh>
 #include <dumux/linear/amgparallelhelpers.hh>

dumux/linear/amgparallelhelpers.hh

@@ -25,8 +25,11 @@
 #ifndef DUMUX_AMGPARALLELHELPERS_HH
 #define DUMUX_AMGPARALLELHELPERS_HH
 
+#include <dune/geometry/dimension.hh>
+#include <dune/grid/common/datahandleif.hh>
 #include <dune/istl/owneroverlapcopy.hh>
 #include <dune/istl/paamg/pinfo.hh>
+#include <dumux/common/properties.hh>
 
 namespace Dumux
 {