spi: ppc4xx: use of_property_read_u32 for clock frequency

Replace of_get_property with of_property_read_u32 for the
"clock-frequency" property, which is the modern typed DT accessor
that returns an error code directly and avoids the raw const unsigned
int * pointer dance.

Also drop the dev_err_probe wrapper on devm_request_irq failure,
returning ret directly since the core already logs probe errors.

Get rid of irqnum in the private struct. It's only used in _probe. Was
used in _remove before devm to free the irq.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://patch.msgid.link/20260728202932.16207-1-rosenp@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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