ASoC: atmel: tse850: fix off-by-one in the "ANA" enumeration count

At some point I added the "Low" entry at the beginning of the array
without bumping the enumeration count from 9 to 10. Fix this. While at
it, fix the anti-pattern for the other enumeration (used by MUX{1,2}).

Fixes: aa431124 ("ASoC: atmel: tse850: add ASoC driver for the Axentia TSE-850")
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org