spi: virtio: fix max frequency setting plus minor cleanup

Francesco Valla <francesco@valla.it> says:

while developing a virtio-spi device, I noticed that the spi-virtio
driver in not honoring the indication on the maximum transfer frequency
supported by the device that this one indicates using the config space.
Patch 1 contains a fix for that.

While at it, I did a minor cleanup inside the function parsing the
config space, where a value was stored into the driver's private data
without a further usage, wasting (a very tiny amount of) memory.

This was tested against a (still unreleased) virtio device running on
a Cortex-M33, with remoteproc as virtio transport.

Link: https://patch.msgid.link/20260915-virtio-spi-fix2-v1-0-7a474cb1b13b@valla.it

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