spi: dw: Use the rx-sample-delay-ns value parsed by the core

The core now parses the "rx-sample-delay-ns" peripheral property into
spi_device.rx_sample_delay_ns, so drop the private copy of that parsing.

The controller-wide default is deliberately left alone. It is read from
the *controller* node into dws->def_rx_sample_dly_ns, which is a
different node and none of the core's business when it parses properties
of a peripheral.

One corner case changes: the peripheral value is now treated as unset
when it is zero, whereas before an absent property could be told apart
from an explicit "rx-sample-delay-ns = <0>", the latter overriding a
non-zero controller default with no delay at all. There are no in-tree
users affected by this and it is very unlikely for out-of-tree users
to set rx-sample-delay-ns on the controller level and then revert it
to 0 at the chip level. We should abandon this configuration that was
probably never meant to work like this and doesn't make sense.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Link: https://patch.msgid.link/20260921-spi-sample-delay-cleanup-v2-3-b460d572fd32@kontron.de
Signed-off-by: Mark Brown <broonie@kernel.org>

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