ata: Add support for PxSCT.LPM set based on actual LPM capability

zhaoxin inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I40QDN


CVE: NA

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The ahci spec mentions that when PxCMD.PSC/SSC is cleared to '0',
the PxSCTL.LPM field in each port must be programmed to disallow
device initiated Partial/Slumber requests.

Signed-off-by: LeoLiu-oc <LeoLiu-oc@zhaoxin.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Acked-by: Jackie Liu <liuyun01@kylinos.cn>
Reviewed-by: Jason Yan <yanaijie@huawei.com>