[ALSA] ymfpci: add request_firmware()

Load the DSP and controller microcode using request_firmware(), if
possible, instead of using the built-in firmware.

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 ee37de9..fcbf967 100644
--- a/sound/pci/Kconfig
+++ b/sound/pci/Kconfig
@@ -735,6 +735,7 @@
 config SND_YMFPCI
 	tristate "Yamaha YMF724/740/744/754"
 	depends on SND
+	select FW_LOADER
 	select SND_OPL3_LIB
 	select SND_MPU401_UART
 	select SND_AC97_CODEC