drivers: spi: stm32: LOG_INF should be LOG_DBG to not clutter console

Drivers should only log extra information during initialization if
debug logging is enabled. Otherwise it always clutters the console
when not required.

Signed-off-by: Hein Wessels <heinwessels93@gmail.com>

drivers/spi/spi_ll_stm32.c

@@ -1038,7 +1038,7 @@ static int spi_stm32_init(const struct device *dev)
 		return -ENODEV;
 	}
 
-	LOG_INF(" SPI with DMA transfer");
+	LOG_DBG("SPI with DMA transfer");
 
 #endif /* CONFIG_SPI_STM32_DMA */