Point to node GNU GCC Linaro's 6.2.1 toolchain under non-arm enviromment

The GNU GCC Linaro 6.2.1 toolchain is now part for the
node (docker-amd64-tf-a-ubuntu:bionic) so use the latter instead of
internal Arm one in case of non-arm enviroment.

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: I401617dcf3c6c9c0a9992c054b3692355d5e53c6
diff --git a/script/build_package.sh b/script/build_package.sh
index cd5caf2..9bdf736 100755
--- a/script/build_package.sh
+++ b/script/build_package.sh
@@ -617,7 +617,7 @@
 
 	scp_tools_arm_tf="$scp_tools_root/arm-tf"
 
-	cross_compile="/arm/pdsw/tools/gcc-linaro-6.2.1-2016.11-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-"
+	cross_compile="$(set_cross_compile_gcc_linaro_toolchain)"
 
 	std_libs="-I$scp_tools_arm_tf/include/common"
 	std_libs="$std_libs -I$scp_tools_arm_tf/include/common/tbbr"
@@ -663,7 +663,7 @@
 
 	cd "$scp_tools_root/arm-tf"
 
-	cross_compile="/arm/pdsw/tools/gcc-linaro-6.2.1-2016.11-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-"
+	cross_compile="$(set_cross_compile_gcc_linaro_toolchain)"
 
 	if [ "$1" = "release" ]; then
 		echo "Build TF-4-SCP-Tools rls..."
@@ -694,7 +694,7 @@
 
 	cd "$scp_tools_root/arm-tf"
 
-	cross_compile="/arm/pdsw/tools/gcc-linaro-6.2.1-2016.11-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-"
+	cross_compile="$(set_cross_compile_gcc_linaro_toolchain)"
 
 	if [ ! -d "$scp_root/build/product/juno/scp_ramfw/debug" ]; then
 		make fiptool