[POWERPC] cell: add spu_64k_pages_available() check

Add a function spu_64k_pages_available(), so that we can abstract the
explicity use of mmu_psize_defs() in lssca_alloc.c

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/include/asm-powerpc/spu.h b/include/asm-powerpc/spu.h
index 844c7cd..3308ed4 100644
--- a/include/asm-powerpc/spu.h
+++ b/include/asm-powerpc/spu.h
@@ -214,6 +214,7 @@
 
 extern void spu_invalidate_slbs(struct spu *spu);
 extern void spu_associate_mm(struct spu *spu, struct mm_struct *mm);
+int spu_64k_pages_available(void);
 
 /* Calls from the memory management to the SPU */
 struct mm_struct;