x86/NUMA: fix setup_node()

x86/NUMA: fix setup_node()

The function referenced an __initdata object (nodes_found). Since this
being a node mask was more complicated than needed, the variable gets
replaced by a simple counter. Check at once that the count of nodes
doesn't go beyond MAX_NUMNODES.

Also consolidate four printk()s related to the function's use into just
one.

Finally (quite the opposite of the above issue) __init-annotate
nodes_cover_memory().

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>