firmware: ti_sci: Introduce Power Management Ops

Introduce power management ops supported by the TISCI
Low Power Mode API [1].

1) TISCI_MSG_LPM_WAKE_REASON
Get which wake up source woke the SoC from Low Power Mode.
The wake up source IDs will be common for all K3 platforms.

2) TISCI_MSG_LPM_SET_DEVICE_CONSTRAINT
Set LPM constraint on behalf of a device. By setting a constraint, the
device ensures that it will not be powered off or reset in the selected
mode.

3) TISCI_MSG_LPM_SET_LATENCY_CONSTRAINT
Set LPM resume latency constraint. By setting a constraint, the host
ensures that the resume time from selected mode will be less than the
constraint value.

[1] https://software-dl.ti.com/tisci/esd/latest/2_tisci_msgs/pm/lpm.html

Signed-off-by: Dave Gerlach <[email protected]>
[[email protected]: LPM_WAKE_REASON and IO_ISOLATION support]
Signed-off-by: Georgi Vlaev <[email protected]>
[[email protected]: SET_DEVICE_CONSTRAINT support]
Signed-off-by: Akashdeep Kaur <[email protected]>
[[email protected]: SET_LATENCY_CONSTRAINT support]
Signed-off-by: Vibhore Vardhan <[email protected]>
Signed-off-by: Kevin Hilman <[email protected]>
Reviewed-by: Akashdeep Kaur <[email protected]>
Tested-by: Dhruva Gole <[email protected]>
Signed-off-by: Markus Schneider-Pargmann <[email protected]>
Tested-by: Kevin Hilman <[email protected]>
Tested-by: Roger Quadros <[email protected]>
Acked-by: Dhruva Gole <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Nishanth Menon <[email protected]>

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