ALSA: core: Handle user defined ioctls

Handle ioctl magic 'U' as an user defined ioctl so that ALSA core calls
substream's ioctl handler.  This gets rid of a requirement that ALSA core
needs to be changed every time when a new user defined ioctl is introduced.

Change-Id: I8dfebb3100ac40670032e3bd6ca40defc9ac1140
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
1 file changed