aspeed-adc driver kpanic

[Patrick Williams]

Hi Billy,

When I run the latest linux-5.14 on QEMU with the Witherspoon config, I end up
with a kernel panic[1].  I think there is an ordering problem in the aspeed_adc
driver.  

See [2,3].  The code registers with devm a pointer to the prescaler object which
is not yet created.  I think it is possible that the struct value contains
uninitialized data as well.  Can you please take a look at this?

1. https://gist.github.com/williamspatrick/4a0f0d1e0ca6f54816461a8df09e6cb8
2. https://github.com/openbmc/linux/blob/dev-5.14/drivers/iio/adc/aspeed_adc.c#L513
3. https://github.com/openbmc/linux/blob/dev-5.14/drivers/iio/adc/aspeed_adc.c#L527

-- 
Patrick Williams
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