[ALSA] maestro3: add request_firmware()

Load the ASSP codes using request_firmware(), if possible, instead of
using the built-in blobs.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/pci/Kconfig b/sound/pci/Kconfig
index 7573997..1bcfb3a 100644
--- a/sound/pci/Kconfig
+++ b/sound/pci/Kconfig
@@ -587,6 +587,7 @@
 config SND_MAESTRO3
 	tristate "ESS Allegro/Maestro3"
 	depends on SND
+	select FW_LOADER
 	select SND_AC97_CODEC
 	help
 	  Say Y here to include support for soundcards based on ESS Maestro 3