hulk inclusion
category: bugfix
bugzilla: NA
CVE: NA

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When CONFIG_KEXEC is off, CRASH_MAX_USABLE_RANGES is undeclared.

Fixes: 566b8e635c6b (memblock: extend memblock_cap_memory_range to
multiple ranges)
Signed-off-by: NChen Zhou <chenzhou10@huawei.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>