xen/x86: use paddr_t for addresses in NUMA node structure

xen/x86: use paddr_t for addresses in NUMA node structure

NUMA node structure "struct node" is using u64 as node memory
range. In order to make other architectures can reuse this
NUMA node relative code, we replace the u64 to paddr_t. And
use pfn_to_paddr and paddr_to_pfn to replace explicit shift
operations. The relate PRIx64 in print messages have been
replaced by PRIpaddr at the same time. And some being-phased-out
types like u64 in the lines we have touched also have been
converted to uint64_t or unsigned long.

Tested-by: Jiamei Xie <jiamei.xie@arm.com>
Signed-off-by: Wei Chen <wei.chen@arm.com>
Acked-by: Jan Beulich <jbeulich@suse.com>