asm-generic/tlb.h: build fix

bring back the avr32, blackfin, sh, sparc architectures into working order,
by reverting the effects of this change that came in via the x86 tree:

   commit a5a19c63f4e55e32dc0bc3d936d7f94793d8b380
   Author: Jeremy Fitzhardinge <jeremy@goop.org>
   Date:   Wed Jan 30 13:33:39 2008 +0100

       x86: demacro asm-x86/pgalloc_32.h

Sorry about that!

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
index 6ce9f3a..75f2bfa 100644
--- a/include/asm-generic/tlb.h
+++ b/include/asm-generic/tlb.h
@@ -15,6 +15,7 @@
 
 #include <linux/swap.h>
 #include <linux/quicklist.h>
+#include <asm/pgalloc.h>
 #include <asm/tlbflush.h>
 
 /*