ALSA: seq: Drop snd_seq_autoload_lock() and _unlock()

The autoload lock became already superfluous due to the recent rework
of autoload code.  Let's drop them now.  This allows us to simplify a
few codes nicely.

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

diff --cc include/sound/seq_kernel.h
Simple merge

diff --cc sound/core/seq/oss/seq_oss.c
Simple merge

diff --cc sound/core/seq/seq_device.c
Simple merge

diff --cc sound/core/seq/seq_dummy.c
Simple merge

diff --cc sound/core/seq/seq_midi.c
Simple merge