architecture hooks for mem_map initialization

This patch is from the IA64 tree, with minor cleanups from me.

Split out initialization of pgdat->node_mem_map into a separate function and allow architectures to override it. This is needed for HP IA64 machines that have a virtually mapped memory map to support big memory holes without having to use discontigmem.

(memmap_init_zone is non-static to allow the IA64 code to use it -
I did that instead of passing it's address into the arch hook as it is done currently in the IA64 tree)

@@ -486,6 +486,8 @@
 extern void free_area_init_node(int nid, pg_data_t *pgdat, struct page *pmap,
 	unsigned long * zones_size, unsigned long zone_start_pfn, 
 	unsigned long *zholes_size);
+extern void memmap_init_zone(struct page *, unsigned long, int,
+	unsigned long, unsigned long);
 extern void mem_init(void);
 extern void show_mem(void);
 extern void si_meminfo(struct sysinfo * val);

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