x86/kvm: Fix compile warning in kvm_register_steal_time()

Fix the following compile warning in kvm_register_steal_time():

  CC      arch/x86/kernel/kvm.o
  arch/x86/kernel/kvm.c: In function ‘kvm_register_steal_time’: arch/x86/kernel/kvm.c:302:3:
  warning: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘phys_addr_t’ [-Wformat]

Introduced via:

  5dfd486c x86, kvm: Fix kvm's use of __pa() on percpu areas
  d7656534 x86, mm: Create slow_virt_to_phys()
  f3c4fbb6 x86, mm: Use new pagetable helpers in try_preserve_large_page()
  4cbeb51b x86, mm: Pagetable level size/shift/mask helpers
  a25b9316 x86, mm: Make DEBUG_VIRTUAL work earlier in boot

Signed-off-by: Shuah Khan <shuah.khan@hp.com>
Acked-by: Gleb Natapov <gleb@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: shuahkhan@gmail.com
Cc: avi@redhat.com
Cc: gleb@redhat.com
Cc: mst@redhat.com
Link: http://lkml.kernel.org/r/1360119442.8356.8.camel@lorien2


Signed-off-by: Ingo Molnar <mingo@kernel.org>