Limit SPI device debug prints with CONFIG_DEBUG_SPI_FLASH

Fix debug printks which were not using CONFIG_DEBUG_SPI_FLASH,
which would cause long delays durring boot when SPI devices
were written.

Change-Id: I99fc3d5f847fdf4bb98e2a0342ea418ab7d5fc54
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: http://review.coreboot.org/1965
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/drivers/spi/eon.c

@@ -112,8 +112,10 @@ static int eon_write(struct spi_flash *flash,
 		byte_addr = 0;
 	}
 
-	printk(BIOS_INFO, "SF: EON: Successfully programmed %zu bytes @ 0x%x\n",
+#if CONFIG_DEBUG_SPI_FLASH
+	printk(BIOS_SPEW, "SF: EON: Successfully programmed %zu bytes @ 0x%x\n",
 	      len, offset);
+#endif
 
 	spi_release_bus(flash->spi);
 	return ret;