memblock: ensure there is no overflow in memblock_overlaps_region()

mainline inclusion
from mainline-v5.14-rc1
commit 023accf5
category: bugfix
bugzilla: 172285 https://gitee.com/openeuler/kernel/issues/I4DDEL



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There maybe an overflow in memblock_overlaps_region() if it is called with
base and size such that

	base + size > PHYS_ADDR_MAX

Make sure that memblock_overlaps_region() caps the size to prevent such
overflow and remove now duplicated call to memblock_cap_size() from
memblock_is_region_reserved().

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Chen Huang <chenhuang5@huawei.com>
Reviewed-by: Chen Wandun <chenwandun@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>