Because callers of efi_phys_get_time() pass virtual stack
addresses as arguments, we need to find their corresponding
physical addresses and when calling GetTime() in physical mode.

Without this patch the following line is printed on boot,

	"Oops: efitime: can't read time!"
Signed-off-by: Maurice Ma <maurice.ma@intel.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Matthew Garrett <mjg@redhat.com>
Link: http://lkml.kernel.org/r/1318330333-4617-1-git-send-email-matt@console-pimps.orgSigned-off-by: Ingo Molnar <mingo@elte.hu>