[PATCH] spi: bcm2835: do not unregister controller in shutdown handler

[Mark Brown]

On Mon, Oct 04, 2021 at 10:44:34AM -0700, Florian Fainelli wrote:

> Anyway, we are divergin slightly here, how do we go about fixing
> .shutdown here?

Implement something in the core which will stop any new operations being
requested and flush existing ones then update the driver to just do
whatever is needed to turn off the hardware.
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