kdump: replace memblock_phys_alloc_range() with memblock_find_in_range() + memblock_reserve()

hulk inclusion
category: bugfix
bugzilla: 47954
CVE: NA

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When kdump and kmemleak are enabled at the same time, the system may
oops.
Replace memblock_phys_alloc_range() with memblock_find_in_range() +
memblock_reserve() to fix this.

Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Reviewed-by: Jing Xiangfeng <jingxiangfeng@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>