[ALSA] remove 'ALSA' from Kconfig USB menu name

USB
make ISA, PCI and USB device look the same in {q,x,menu}config
Signed-off-by: Thierry Vignaud <tvignaud@mandrakesoft.com>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

sound/usb/Kconfig

 # ALSA USB drivers
 
-menu "ALSA USB devices"
+menu "USB devices"
 	depends on SND!=n && USB!=n
 
 config SND_USB_AUDIO