iommu/arm-smmu-v3: Disable ECMDQ before reset

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I97CSY



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In kdump kernel, the ECMDQ is enabled before and cannot be reset before
it is disabled. This leads to "CMD_SYNC timeout" problem.

Disable the ECMDQ before reset the ECMDQ to fix.

Signed-off-by: Wang Wensheng <wangwensheng4@huawei.com>