Print physical address info in a style consistent with the %pR style
used elsewhere in the kernel.

Commit 69f1d475 did this for a similar printk in this file, but I
must have missed this one.
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>