Change in coreboot[master]: rockchip/rk3399: extend delay between saradc power up and start command

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Change subject: rockchip/rk3399: extend delay between saradc power up and start command
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/66886/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/21474/ : SUCCESS