ia64: remove the kern_mem_attribute export

No actually used anywhere.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/efi.c

@@ -842,7 +842,6 @@ kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 	} while (md);
 	return 0;	/* never reached */
 }
-EXPORT_SYMBOL(kern_mem_attribute);
 
 int
 valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)