greybus: audio: Update device type based on widget types

Device type info shared to above HAL is currently hard coded
to SPK only. Actual device type is identifed while parsing
widget types from topology FW shared by codec module.

Signed-off-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Reviewed-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>