arm64: Fix reserved memory via memmap

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I56F4Z


CVE: NA

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When efi is enabled, the memory block will initialize after early
parameters parse. And, memblock_setclr_flag should be used after
the initialization of the memory block.

However, "arm64: Request resources for reserved memory via memmap"
could use memblock_setclr_flag when the memory block is empty. To
fix this, memblock_setclr_flag should call after the initialization
of the memory block.

Fixes: 374db2be ("arm64: Request resources for reserved memory via memmap")
Signed-off-by: Peng Liu <liupeng256@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>