ALSA: line6: Move the contents of usbdefs.h into driver.h

Most of them are rather relevant with the definitions in driver.h,
and there are only a few lines, so just rip it off.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --cc sound/usb/line6/driver.c
Simple merge

diff --cc sound/usb/line6/driver.h
Simple merge

diff --cc sound/usb/line6/midi.c
Simple merge

diff --cc sound/usb/line6/pcm.h
Simple merge

diff --cc sound/usb/line6/pod.c
Simple merge

diff --cc sound/usb/line6/podhd.c
Simple merge

diff --cc sound/usb/line6/toneport.c
Simple merge

diff --cc sound/usb/line6/usbdefs.h
Simple merge

diff --cc sound/usb/line6/variax.c
Simple merge