x86 headers: include page_types.h in pgtable_types.h

To properly pick up details like PTE_FLAGS_MASK.
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/pgtable_types.h

@@ -2,6 +2,7 @@
 #define _ASM_X86_PGTABLE_DEFS_H
 
 #include <linux/const.h>
+#include <asm/page_types.h>
 
 #define FIRST_USER_ADDRESS	0