sound/oss/pss: Remove typedefs pss_mixerdata and pss_confdata

The Linux kernel coding style guidelines suggest not using typedefs
for structure types. This patch gets rid of the typedefs for pss_mixerdata
and pss_confdata.

The following Coccinelle semantic patch is used to make the change.

@tn@
identifier i;
type td;
@@

-typedef
 struct i { ... }
-td
 ;

@@
type tn.td;
identifier tn.i;
@@

-td
+ struct i

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Takashi Iwai <tiwai@suse.de>