spi: add EXPORT_SYMBOL_GPL(devm_spi_optimize_message)

devm_spi_optimize_message() is a public function and needs
EXPORT_SYMBOL_GPL.
Reported-by: Jonathan Cameron <jic23@kernel.org>
Closes: https://lore.kernel.org/linux-iio/20240624204424.6a91a5e4@jic23-huawei/
Fixes: d4a0055f ("spi: add devm_spi_optimize_message() helper")
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20240624-devm_spi_optimize_message-v2-1-58155c0180c2@baylibre.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi.c

@@ -4404,6 +4404,7 @@ int devm_spi_optimize_message(struct device *dev, struct spi_device *spi,
 
 	return devm_add_action_or_reset(dev, devm_spi_unoptimize_message, msg);
 }
+EXPORT_SYMBOL_GPL(devm_spi_optimize_message);
 
 /**
  * spi_async - asynchronous SPI transfer