ASoC: cs4349: Fix max_register setting for cs4349_regmap

The max_register should be the maximum valid register index rather than
number of registers. Also remove unused defines.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Tim Howe <tim.howe@cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>