spi: bcm53xx: Add missing module information

Mainly to fix missing MODULE_LICENSE.
Also add MODULE_DESCRIPTION and MODULE_AUTHOR.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-bcm53xx.c

@@ -293,3 +293,7 @@ static void __exit bcm53xxspi_module_exit(void)
 
 module_init(bcm53xxspi_module_init);
 module_exit(bcm53xxspi_module_exit);
+
+MODULE_DESCRIPTION("Broadcom BCM53xx SPI Controller driver");
+MODULE_AUTHOR("Rafał Miłecki <zajec5@gmail.com>");
+MODULE_LICENSE("GPL");