asoc: Add effects controls in loopback driver

Add audio effects related controls in transcode loopback driver to
support audio effects in hardware loopback usecase.
Update transcode loopback driver to support configuration of DSP render
window. Render window is used by DSP to take rendering decision.
i.e whether input frame should be rendered, dropped or repeated.

Change-Id: I09bb725d980b8051eae3a245584e2b66cd2af7ff
Signed-off-by: Trinath Thammishetty <tthamish@codeaurora.org>