spi: stm32-qspi: Update spi registering

[Mark Brown]

On Thu, Jan 06, 2022 at 02:20:52PM +0100, patrice.chotard at foss.st.com wrote:
> From: Patrice Chotard <patrice.chotard at foss.st.com>
> 
> Replace devm_spi_register_master() by spi_register_master() to ensure
> that spi sub-nodes are unregistered in the correct order when qspi driver
> is removed.

This commit message doesn't describe the actual issue.  The change is
fixing ordering within the driver itself - the driver is freeing things
in the remove() callback which are used by the controller but thanks to
the use of devm the controller isn't unregistered from the core until
after the remove() callback has run so we might still have something
running.  "Subnodes" aren't an issue here.

Please submit patches using subject lines reflecting the style for the
subsystem, this makes it easier for people to identify relevant patches.
Look at what existing commits in the area you're changing are doing and
make sure your subject lines visually resemble what they're doing.
There's no need to resubmit to fix this alone.
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