arch/x86: add missing include to sparsemem.h

sparsemem.h:34:32: error: unknown type name 'phys_addr_t'
extern int phys_to_target_node(phys_addr_t start);
                               ^
sparsemem.h:36:39: error: unknown type name 'u64'
extern int memory_add_physaddr_to_nid(u64 start);
                                      ^

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Change-Id: I7011b076dff568fbdaed76ce601413c38a9d42bb

arch/x86/include/asm/sparsemem.h

@@ -2,6 +2,8 @@
 #ifndef _ASM_X86_SPARSEMEM_H
 #define _ASM_X86_SPARSEMEM_H
 
+#include <linux/types.h>
+
 #ifdef CONFIG_SPARSEMEM
 /*
  * generic non-linear memory support: