memblock: extend memblock_cap_memory_range to multiple ranges

hulk inclusion
category: feature
bugzilla: 12800
CVE: NA

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The memblock_cap_memory_range() removes all the memory except the
range passed to it. Extend this function to receive an array of
memblock_regions that should be kept. This allows switching to
simple iteration over memblock arrays with 'for_each_mem_range_rev'
to remove the unneeded memory.

Enable use of this function in arm64 for reservation of multiple
regions for the crash kernel.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Reviewed-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>