ASoC: mdmcalifornium: Rename dummydevice in the auto card

Rename the dummydevice driver in the automotive card to avoid
conflicts with the regular sound card. The conflict was causing
kobject error.

Change-Id: I6548e8b7400191d5fc76976cd057b973c66e36ce
Signed-off-by: Gustavo Solaira <gustavos@codeaurora.org>