axfer: obsolete some unimplemented options

axfer: obsolete some unimplemented options

Althogh many options are actually supported by aplay, some of them are
not enough good in practical points. For example, '--test-position'
option is meaningless for some use cases. Furthermore, due to practical
reasons, some options are not implemented well; e.g. vumeter.

This commit marks such options as 'obsoleted'.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>