ALSA: portman2x4: remove unused portman_read_command,data functions

clang with W=1 reports
sound/drivers/portman2x4.c:185:18: error: unused function
  'portman_read_command' [-Werror,-Wunused-function]
static inline u8 portman_read_command(struct portman *pm)
                 ^
sound/drivers/portman2x4.c:195:18: error: unused function
  'portman_read_data' [-Werror,-Wunused-function]
static inline u8 portman_read_data(struct portman *pm)
                 ^
These static functions are not used, so remove them.
Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230318135229.1685266-1-trix@redhat.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/portman2x4.c

@@ -182,21 +182,11 @@ static inline void portman_write_command(struct portman *pm, u8 value)
 	parport_write_control(pm->pardev->port, value);
 }
 
-static inline u8 portman_read_command(struct portman *pm)
-{
-	return parport_read_control(pm->pardev->port);
-}
-
 static inline u8 portman_read_status(struct portman *pm)
 {
 	return parport_read_status(pm->pardev->port);
 }
 
-static inline u8 portman_read_data(struct portman *pm)
-{
-	return parport_read_data(pm->pardev->port);
-}
-
 static inline void portman_write_data(struct portman *pm, u8 value)
 {
 	parport_write_data(pm->pardev->port, value);