spi: axi-spi-engine: remove platform_set_drvdata()

platform_get_drvdata() is never called in the AXI SPI Engine driver, so
platform_set_drvdata() is not needed. Remove it. This also lets us
avoid the final error check in the probe function.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20240626-spi-axi-spi-engine-remove-drvdata-v1-1-1752e372dd5d@baylibre.com


Signed-off-by: Mark Brown <broonie@kernel.org>