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/docs/plat/hikey960.rst b/docs/plat/hikey960.rst
index 8524b48..63cfc92 100644
--- a/docs/plat/hikey960.rst
+++ b/docs/plat/hikey960.rst
@@ -83,6 +83,7 @@
 
        cd ${BUILD_PATH}/l-loader
        ln -sf ${EDK2_OUTPUT_DIR}/FV/bl1.bin
+       ln -sf ${EDK2_OUTPUT_DIR}/FV/bl2.bin
        ln -sf ${EDK2_OUTPUT_DIR}/FV/fip.bin
        ln -sf ${EDK2_OUTPUT_DIR}/FV/BL33_AP_UEFI.fd
        make hikey960
@@ -130,13 +131,14 @@
 -  Fetch that are used in recovery mode. The code location is in below.
    `link <https://github.com/96boards-hikey/tools-images-hikey960>`__
 
--  Generate l-loader.bin.
+-  Prepare recovery binary.
 
    .. code:: shell
 
        $cd tools-images-hikey960
        $ln -sf ${BUILD_PATH}/l-loader/l-loader.bin
        $ln -sf ${BUILD_PATH}/l-loader/fip.bin
+       $ln -sf ${BUILD_PATH}/l-loader/recovery.bin
 
 -  Prepare config file.
 
@@ -146,7 +148,7 @@
        # The content of config file
        ./sec_usb_xloader.img 0x00020000
        ./sec_uce_boot.img 0x6A908000
-       ./l-loader.bin 0x1AC00000
+       ./recovery.bin 0x1AC00000
 
 -  Remove the modemmanager package. This package may causes hikey\_idt tool failure.
 
@@ -154,7 +156,7 @@
 
        $sudo apt-get purge modemmanager
 
--  Run the command to download l-loader.bin into HiKey960.
+-  Run the command to download recovery.bin into HiKey960.
 
    .. code:: shell