parisc: fix compile breakage caused by inlining maybe_mkwrite

on Parisc, we have an include of linux/mm.h inside our asm/pgtable.h, so
this patch

commit 14fd403f
Author: Andrea Arcangeli <aarcange@redhat.com>
Date:   Thu Jan 13 15:46:37 2011 -0800

    thp: export maybe_mkwrite

Causes us an unsatisfiable use of pte_mkwrite in linux/mm.h

The fix is obviously not to include linux/mm.h in our pgtable.h, which
unbreaks the build.
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

arch/parisc/include/asm/pgtable.h

@@ -10,11 +10,13 @@
  * we simulate an x86-style page table for the linux mm code
  */
 
-#include <linux/mm.h>		/* for vm_area_struct */
 #include <linux/bitops.h>
+#include <linux/spinlock.h>
 #include <asm/processor.h>
 #include <asm/cache.h>
 
+struct vm_area_struct;
+
 /*
  * kern_addr_valid(ADDR) tests if ADDR is pointing to valid kernel
  * memory.  For the return value to be meaningful, ADDR must be >=