pmdomain: arm: scmi_pm_domain: Remove redundant state verification

Currently, scmi_pd_power() explicitly verifies whether the requested
power state was applied by calling state_get(). While this check could
detect failures where the state was not properly updated, ensuring
correctness is the responsibility of the SCMI firmware.

Removing this redundant state_get() call eliminates an unnecessary
round-trip to the firmware, improving efficiency. Any mismatches
between the requested and actual states should be handled by the SCMI
firmware, which must return a failure if state_set() is unsuccessful.

Additionally, in some cases, checking the state after powering off a
domain may be unreliable or unsafe, depending on the firmware
implementation.

This patch removes the redundant verification, simplifying the function
without compromising correctness.

Reported-and-tested-by: Ranjani Vaidyanathan <[email protected]>
Signed-off-by: Sudeep Holla <[email protected]>
Reviewed-by: Peng Fan <[email protected]>
Reviewed-by: Cristian Marussi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

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