ia64: fix min_low_pfn/max_low_pfn build errors

Fix min_low_pfn/max_low_pfn build errors for arch/ia64/: (e.g.)

 ERROR: "max_low_pfn" [drivers/rpmsg/virtio_rpmsg_bus.ko] undefined!
 ERROR: "min_low_pfn" [drivers/rpmsg/virtio_rpmsg_bus.ko] undefined!
 ERROR: "min_low_pfn" [drivers/hwtracing/intel_th/intel_th_msu.ko] undefined!
 ERROR: "max_low_pfn" [drivers/hwtracing/intel_th/intel_th_msu.ko] undefined!
 ERROR: "min_low_pfn" [drivers/crypto/cavium/nitrox/n5pf.ko] undefined!
 ERROR: "max_low_pfn" [drivers/crypto/cavium/nitrox/n5pf.ko] undefined!
 ERROR: "max_low_pfn" [drivers/md/dm-integrity.ko] undefined!
 ERROR: "min_low_pfn" [drivers/md/dm-integrity.ko] undefined!
 ERROR: "max_low_pfn" [crypto/tcrypt.ko] undefined!
 ERROR: "min_low_pfn" [crypto/tcrypt.ko] undefined!
 ERROR: "min_low_pfn" [security/keys/encrypted-keys/encrypted-keys.ko] undefined!
 ERROR: "max_low_pfn" [security/keys/encrypted-keys/encrypted-keys.ko] undefined!
 ERROR: "min_low_pfn" [arch/ia64/kernel/mca_recovery.ko] undefined!
 ERROR: "max_low_pfn" [arch/ia64/kernel/mca_recovery.ko] undefined!

David suggested just exporting min_low_pfn & max_low_pfn in
mm/memblock.c:
https://lore.kernel.org/lkml/alpine.DEB.2.22.394.2006291911220.1118534@chino.kir.corp.google.com/

Reported-by: kernel test robot <[email protected]>
Signed-off-by: Randy Dunlap <[email protected]>
Acked-by: David Rientjes <[email protected]>
Acked-by: Tony Luck <[email protected]>
Cc: [email protected]
Cc: Andrew Morton <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: [email protected]
Signed-off-by: Mike Rapoport <[email protected]>

arch/ia64/kernel/ia64_ksyms.c

@@ -3,7 +3,7 @@
  * Architecture-specific kernel symbols
  */
 
-#ifdef CONFIG_VIRTUAL_MEM_MAP
+#if defined(CONFIG_VIRTUAL_MEM_MAP) || defined(CONFIG_DISCONTIGMEM)
 #include <linux/compiler.h>
 #include <linux/export.h>
 #include <linux/memblock.h>