KVM: x86: minor code refactor and comments fixup around dirty logging

Consolidate the code and correct the comments to show that the actions
taken to update existing mappings to disable or enable dirty logging
are not necessary when creating, moving, or deleting a memslot.

Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Message-Id: <1591128450-11977-4-git-send-email-anthony.yznaga@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>