ASoC: wcd-spi: handle WDSP_EVENT_GETOPS in the event handler

Add functionality to handle the WDSP_EVENT_GETOPS event and provide
the required operations to the manager driver. This is helpful for
manager or other components to call into the operations to request
functionality from this component.

Change-Id: I49232e11cbfca89f6ff8ac711c12ae6a39dcbd00
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>