Revert "GCC: Upgrade to version 9.2-2019.12 of toolchain"

This reverts commit de9bf1d8a2de952bfc17cdf7082b41f9c185e54d.

Change-Id: Iebb6297ce290a10ee850bf6a9c71e7eb530b085f
diff --git a/docs/plat/ls1043a.rst b/docs/plat/ls1043a.rst
index 5a8f755..72a51f3 100644
--- a/docs/plat/ls1043a.rst
+++ b/docs/plat/ls1043a.rst
@@ -59,13 +59,13 @@
 
    .. code:: shell
 
-       CROSS_COMPILE=aarch64-none-elf- make PLAT=ls1043 bl1
+       CROSS_COMPILE=aarch64-linux-gnu- make PLAT=ls1043 bl1
 
    Build fip:
 
    .. code:: shell
 
-       CROSS_COMPILE=aarch64-none-elf- make PLAT=ls1043 fip \
+       CROSS_COMPILE=aarch64-linux-gnu- make PLAT=ls1043 fip \
        BL33=u-boot.bin NEED_BL32=yes BL32=tee.bin SPD=opteed
 
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