hikey960: migrate to bl2_el3

Since non-TF ROM is used in HiKey960 platform (Hisilicon Hi3660 SoC),
replace BL1 by BL2_EL3 in normal boot mode.

When flush images in recovery mode, keep to use BL1.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
diff --git a/plat/hisilicon/hikey960/include/platform_def.h b/plat/hisilicon/hikey960/include/platform_def.h
index f058fd0..a8c05cd 100644
--- a/plat/hisilicon/hikey960/include/platform_def.h
+++ b/plat/hisilicon/hikey960/include/platform_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -56,8 +56,8 @@
 /*
  * BL2 specific defines.
  */
-#define BL2_BASE			(BL1_RW_BASE + 0x8000)	/* 1AC1_8000 */
-#define BL2_LIMIT			(BL2_BASE + 0x40000)	/* 1AC5_8000 */
+#define BL2_BASE			(0x1AC00000)
+#define BL2_LIMIT			(BL2_BASE + 0x58000)	/* 1AC5_8000 */
 
 /*
  * BL31 specific defines.