spi: spi-fsl-dspi: Enable support for S32G platforms

spi: spi-fsl-dspi: Enable support for S32G platforms

Add compatible for S32G platforms, allowing DSPI to be used.

Add a depends for ARCH_NXP which can replace LAYERSCAPE and also
includes the new ARCH_S32 for S32G. Similarly, ARCH_MXC can replace
SOC_VF610 || SOC_LS1021A which should avoid updating this for every new
sub-platform in the future.

Signed-off-by: Ciprian Marian Costea <ciprianmarian.costea@nxp.com>
Signed-off-by: Stoica Cosmin-Stefan <cosmin.stoica@nxp.com>
Signed-off-by: Dan Nica <dan.nica@nxp.com>
Signed-off-by: Larisa Grigore <Larisa.Grigore@nxp.com>
Signed-off-by: Stefan-Gabriel Mirea <stefan-gabriel.mirea@nxp.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Link: https://patch.msgid.link/20250522-james-nxp-spi-v2-13-bea884630cfb@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>