[kernel][vm] Remove old dummy references

The dummy region subtype was removed previously.

Change-Id: I9aabd851726f2d9c9bd2e23eed317a8cd7b26368
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/514684
Reviewed-by: Rasha Eqbal <rashaeqbal@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Fuchsia-Auto-Submit: Adrian Danis <adanis@google.com>
diff --git a/zircon/kernel/vm/include/vm/vm_address_region.h b/zircon/kernel/vm/include/vm/vm_address_region.h
index f90660b..8cb49c59 100644
--- a/zircon/kernel/vm/include/vm/vm_address_region.h
+++ b/zircon/kernel/vm/include/vm/vm_address_region.h
@@ -519,9 +519,6 @@
       TA_REQ(lock()) override;
 
  protected:
-  // constructor for use in creating a VmAddressRegionDummy
-  explicit VmAddressRegion();
-
   friend class VmAspace;
   // constructor for use in creating the kernel aspace singleton
   explicit VmAddressRegion(VmAspace& kernel_aspace);
diff --git a/zircon/kernel/vm/vm_address_region.cc b/zircon/kernel/vm/vm_address_region.cc
index 33bd4ba..53b438d 100644
--- a/zircon/kernel/vm/vm_address_region.cc
+++ b/zircon/kernel/vm/vm_address_region.cc
@@ -50,11 +50,6 @@
   state_ = LifeCycleState::ALIVE;
 }
 
-VmAddressRegion::VmAddressRegion() : VmAddressRegionOrMapping(0, 0, 0, nullptr, nullptr, false) {
-  strlcpy(const_cast<char*>(name_), "dummy", sizeof(name_));
-  LTRACEF("%p '%s'\n", this, name_);
-}
-
 zx_status_t VmAddressRegion::CreateRoot(VmAspace& aspace, uint32_t vmar_flags,
                                         fbl::RefPtr<VmAddressRegion>* out) {
   DEBUG_ASSERT(out);