fix CVE-2022-2962.
The DMA engine is started by I/O access and then itself accesses the
I/O registers, triggering a teentrancy bug.
Fix this bug by restricting the DMA engine to memories regions.
Signed-off-by: Zhang Bo <oscar.zhangbo@huawei.com>
(cherry picked from commit 69b69596a274bd68695dda39ef939ed1ddbf9ba1)
