rawmidi: Fix the prefix of the inactive stream flag
I copied SNDRV_RAWMIDI_INFO_STREAM_INACTIVE definition as is from the
kernel uapi header, but for alsa-lib, it should have been changed to
SND_ prefix instead.
Put the correct definition while keeping the old SNDRV_ definition for
compatibility (that might be already used by applications).
Fixes: 137eca7720be ("rawmidi: Extensions for tied device and substream inactive flag") Signed-off-by: Takashi Iwai <tiwai@suse.de>