ASoC: wsa881x: add new operation for wsa881x enumeration

For wsa881x dynamic detection, create a new function to
handle the enumeration of a wsa881x device. Once a device
is enumerated successfully, this new function will perform
below 2 tasks on the device-
   - register device with regmap
   - register device as a codec with ALSA core.

Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>
Change-Id: I087b6869361e880814a8f11d5912bc6530b56758