tests: benchmarks: multicore: idle_gpio: decrease uart baudrate

[nordic-pikr]

Decrease uart baudrate to get longer wakeup pulse

[NordicBuilder]

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Build number: 2

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Enabled	Name	Description
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	ci-all-test	Run all of ci, no test spec filtering will be done
	ci-force-downstream	Force execution of downstream even if twister fails
	ci-run-twister	Force run twister
	ci-run-zephyr-twister	Force run zephyr twister

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