ALSA: make snd_kcontrol_new name a normal string

When building with W=2, there are lots of warnings about the
snd_kcontrol_new name field being an array of 'unsigned char'
but initialized to a string:

include/sound/soc.h:93:48: warning: pointer targets in initialization of 'const unsigned char *' from 'char *' differ in signedness [-Wpointer-sign]

Make it a regular 'char *' to avoid flooding the build log with this.

Fixes: 1da177e4

 ("Linux-2.6.12-rc2")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20201026165715.3723704-1-arnd@kernel.org


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