nios2: Extend !__ASSEMBLY__ section in asm/page.h

Some C-only definition from nios2 asm/page.h are exposed to assembly code.
Extend the !__ASSEMBLY__ section to prevent this.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Ley Foon Tan <ley.foon.tan@intel.com>

arch/nios2/include/asm/page.h

@@ -76,8 +76,6 @@ extern unsigned long memory_size;
 
 extern struct page *mem_map;
 
-#endif /* !__ASSEMBLY__ */
-
 # define __pa(x)		\
 	((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
 # define __va(x)		\
@@ -106,4 +104,6 @@ extern struct page *mem_map;
 
 #include <asm-generic/getorder.h>
 
+#endif /* !__ASSEMBLY__ */
+
 #endif /* _ASM_NIOS2_PAGE_H */