[u-boot] link aarch64 with LLD

Test: BUILD_CONFIG=u-boot/build.config.qemu.aarch64 ./build/build.sh && \
      qemu-system-aarch64 -machine virt -bios \
      out/u-boot-mainline/dist/u-boot.bin -display none -serial mon:stdio \
      -nographic -cpu cortex-a53 -m 1024
Bug: 164420327
Bug: 203698882
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Change-Id: Iba27d39bfe209a4ab3812a766d1e8d24b664d117
1 file changed