xtensa: nommu: provide _PAGE_CHG_MASK definition

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/include/asm/pgtable.h

@@ -178,6 +178,7 @@
 
 #else /* no mmu */
 
+# define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
 # define PAGE_NONE       __pgprot(0)
 # define PAGE_SHARED     __pgprot(0)
 # define PAGE_COPY       __pgprot(0)