ASoC: rt5677: Add MODULE_FIRMWARE macro

The module loads firmware so add a MODULE_FIRMWARE macro to provide that
information via modinfo.
Signed-off-by: Juerg Haefliger <juerg.haefliger@canonical.com>
Link: https://lore.kernel.org/r/20230616115549.1011903-1-juerg.haefliger@canonical.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5677.c

@@ -5712,3 +5712,5 @@ module_i2c_driver(rt5677_i2c_driver);
 MODULE_DESCRIPTION("ASoC RT5677 driver");
 MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
 MODULE_LICENSE("GPL v2");
+
+MODULE_FIRMWARE("rt5677_elf_vad");