riscv: Add mem kernel parameter support
The memblock_enforce_memory_limit() could change the memblock range, so move the dram_end assignment after it in bootmem_init(), then support mem= cmdline. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
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