arm64: mmu.h: fix PTE_TABLE_AP

The APTable attribute is two bits wide according to the ARMv8-A
architecture reference manual. Fix the macro accordingly.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/arch/arm/include/asm/armv8/mmu.h b/arch/arm/include/asm/armv8/mmu.h
index ce655ce..52cb18b 100644
--- a/arch/arm/include/asm/armv8/mmu.h
+++ b/arch/arm/include/asm/armv8/mmu.h
@@ -51,7 +51,7 @@
 
 #define PTE_TABLE_PXN		(1UL << 59)
 #define PTE_TABLE_XN		(1UL << 60)
-#define PTE_TABLE_AP		(1UL << 61)
+#define PTE_TABLE_AP		(3UL << 61)
 #define PTE_TABLE_NS		(1UL << 63)
 
 /*