VT-d: make print_vtd_entries() less verbose

VT-d: make print_vtd_entries() less verbose

Especially printing virtual addresses of mappings of the individual
pages seems rather useless here - this mostly obfuscates the important
numbers, and hinders comparing two printouts. Printing the page table
level indexes isn't very useful either, as the immediately following
lines will print the indexes again as part of printing the raw entries.

Take the opportunity and also
- adjust some format specifiers,
- widen (zero-pad) array indexes to their nominal width.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>