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make[1]: *** No rule to make target `Image.lzma'.  Stop.

When make ARCH=riscv Image.lzma, it won't work, let's fix it.
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>