Add support for PxSCT.LPM set based on actual LPM circumstances

zhaoxin inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I54V2K


CVE: NA

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AHCI Spec shows that the PxSCTL.IPM field in each port must be programmed
to disallow device initiated LPM requests when HBA can not support
transitions to the LPM state. The current LPM driver has no restrictions
on LPM transitions when enabling device initiated LPM.

Signed-off-by: LeoLiu-oc <LeoLiu-oc@zhaoxin.com>