remove multi* content fetching from resolvers

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

syft/source/location.go

@@ -45,6 +45,14 @@ func NewLocationFromImage(virtualPath string, ref file.Reference, img *image.Ima
 	}
 }
 
+func NewLocationFromReference(ref file.Reference) Location {
+	return Location{
+		VirtualPath: string(ref.RealPath),
+		RealPath:    string(ref.RealPath),
+		ref:         ref,
+	}
+}
+
 func (l Location) String() string {
 	str := ""
 	if l.ref.ID() != 0 {