hvmloader: Make the printfs more informative

hvmloader: Make the printfs more informative

* Warn that you're relocating some BARs to 64-bit

* Warn that you're relocating guest pages, and how many

* Include upper 32-bits of the base register when printing the bar
  placement info

v4:
 - Move message about relocating guest pages into loop, include number
   of pages and guest paddr
 - Fixed minor brace style issue

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
CC: Ian Campbell <ian.campbell@citrix.com>
CC: Ian Jackson <ian.jackson@citrix.com>
CC: Stefano Stabellini <stefano.stabellini@citrix.com>
CC: Hanweidong <hanweidong@huawei.com>
CC: Keir Fraser <keir@xen.org>