staging/easycap: remove TESTONE and EASYCAP_TESTTONE

No longer needed feature for testing driver's handling of
the audio stream independently of the urb completion routine

Cc: Mike Thomas <rmthomas@sciolus.org>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>