of: Enable crashkernel=X,high to support kexec option -s

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I545H8


CVE: NA

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For "crashkernel=X,high", there must be two crash regions: high=crashk_res
and low=crashk_low_res. But now the syscall kexec_file_load() only add the
crashk_res into "linux,usable-memory-range", this causes the second kernel
to have no available dma memory. Fix it like kexec tool do for option -c.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>