spi: cadence-quadspi: Add error logging for DMA request failure

Add dev_err_probe() to log DMA request failures. This properly handles
-EPROBE_DEFER at debug level, reducing log spam during deferred probing.

Signed-off-by: Anurag Dutta <a-dutta@ti.com>
Link: https://patch.msgid.link/20251212072312.2711806-2-a-dutta@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Anurag Dutta

drivers/spi/spi-cadence-quadspi.c

@@ -2001,8 +2001,10 @@ static int cqspi_probe(struct platform_device *pdev)
 
 	if (cqspi->use_direct_mode) {
 		ret = cqspi_request_mmap_dma(cqspi);
-		if (ret == -EPROBE_DEFER)
+		if (ret == -EPROBE_DEFER) {
+			dev_err_probe(&pdev->dev, ret, "Failed to request mmap DMA\n");
 			goto probe_setup_failed;
+		}
 	}
 
 	ret = spi_register_controller(host);