iommu/arm-smmu-v3: Allow disabling ECMDQs at boot time

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7YUNJ



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Add boot option arm_smmu_v3.disable_ecmdq to support disabling ECMDQ
during startup. For example, add arm_smmu_v3.disable_ecmdq=1 in command
line to disable ECMDQ and use normal CMDQ.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>