Build: Generalize NS GCC toolchain link option

NS side build files can call target_add_scatter_file() to specify linker
script for the final output target, instead of hard-coding linker script
target as tfm_ns_scatter.

Change-Id: I42c016bc85edee58be3a4fc34a95ea1c4042b605
Signed-off-by: David Hu <david.hu@arm.com>
1 file changed