driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I78PCH
CVE: NA

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Add a switch in conservative governor. If set 0(default), adopt slow
mode to pursue greater power consumption benefits; Otherwise set 1,
adopt fast mode to reduce performance loss.
Signed-off-by: NJiang Yi <jiangyi38@hisilicon.com>
Signed-off-by: Nxuesinian <xuesinian@huawei.com>