serial: qcom-geni: fix opp vote on shutdown

The operating-performance-point vote needs to be dropped when shutting
down the port to avoid wasting power by keeping resources like power
domains in an unnecessarily high performance state (e.g. when a UART
connected Bluetooth controller is not in use).

Fixes: a5819b548af0 ("tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state")
Cc: [email protected]      # 5.9
Cc: Rajendra Nayak <[email protected]>
Cc: Matthias Kaehlcke <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Acked-by: Konrad Dybcio <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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