ALSA: seq: Fix CONFIG_SND_SEQ_MIDI dependency

The commit 0181307abc ("ALSA: seq: Reorganize kconfig and build")
rewrote the dependency of each sequencer module in a standard way, but
there was one change applied mistakenly: CONFIG_SND_SEQ_MIDI isn't
enabled properly by CONFIG_SND_RAWMIDI.  I seem to have changed the
wrong one instead, CONFIG_SND_SEQ_MIDI_EMUL, which is eventually
reverse-selected by CONFIG_SND_SEQ_MIDI itself.  This ended up the
lack of snd-seq-midi module as reported below.

The fix is to put def_tristate properly to CONFIG_SND_SEQ_MIDI instead
of *_MIDI_EMUL entry.

Fixes: 0181307abc ("ALSA: seq: Reorganize kconfig and build")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=196633
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/seq/Kconfig

@@ -47,10 +47,10 @@ config SND_SEQ_HRTIMER_DEFAULT
 	  timer.
 
 config SND_SEQ_MIDI_EVENT
-	def_tristate SND_RAWMIDI
+	tristate
 
 config SND_SEQ_MIDI
-	tristate
+	def_tristate SND_RAWMIDI
 	select SND_SEQ_MIDI_EVENT
 
 config SND_SEQ_MIDI_EMUL