spi: ath79: use devm everywhere in probe

Use devm_spi_alloc_host() instead of spi_alloc_host() so that the spi
controller is automatically freed on probe failure or device removal.
This lets us eliminate the err_put_host label and goto error path in
probe, as well as the spi_controller_put() call in remove.

It's also a bit weird as everything in probe is using devm except the
first allocating function. Might fix an ordering issue on teardown.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://patch.msgid.link/20260727201543.18857-1-rosenp@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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