ASoC: amd: Fix button configuration

RT5682 buttons were incorrectly mapped.

Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
Link: https://lore.kernel.org/r/20200414113527.13532-1-akshu.agrawal@amd.com


Signed-off-by: Mark Brown <broonie@kernel.org>