powerpc/ps3: remove orphan declarations from ps3av.h

Remove the following orphan declarations from ps3av.h:
1. ps3av_dev_open()
2. ps3av_dev_close()

They have been removed since commit 13a5e30cf740 ("[POWERPC] PS3:
Rework AV settings driver"), so remove them.

Signed-off-by: Gaosheng Cui <[e-mail]>
Acked-by: Geoff Levand <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/powerpc/include/asm/ps3av.h

···
 extern int ps3av_video_mute(int);
 extern int ps3av_audio_mute(int);
 extern int ps3av_audio_mute_analog(int);
-extern int ps3av_dev_open(void);
-extern int ps3av_dev_close(void);
 #endif	/* _ASM_POWERPC_PS3AV_H_ */