[ALSA] When the alsamixer says 'SPDIF Out [Off]', SPDIF output should be off and Analog output should be on.

CA0106 driver
         This fixes a bug whereby when the snd-ca0106 module first loads,
         alsamixer says 'SPDIF Out [Off]' but no analog sound comes from the speakers.

         This covers any bug reports that said things like
         'mixer fails to remember analog output on, when the system is rebooted.'
Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>