arm64: memmap: fix request_resource return error

hulk inclusion
category: bugfix
bugzilla: 187483, https://gitee.com/openeuler/kernel/issues/I5MH9N


CVE: NA

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When support memmap=nn[KMG]$ss[KMG], it will request resource to show
reserved memory in iomem, but with memblock_setclr_flag() called
memblock_mark_memmap() leads to split memblock region and then
request_resource() could return -EBUSY when passed unaligned address.

Let's directly use memblock_reserve() and drop membloc_setclr_flag()
and show error if request_resource() in request_memmap_resource()
return error code.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>