ASoC: wcd9306: Update RX4 mix chain with 3rd input

Update RX4 mix chain with 3rd input, with this change
RX4 mix chain can take an addition input from the available
Input source.

CRs-Fixed: 576170
Change-Id: I142fc5afbb2add3ed147dc0abc833b65081a526f
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>
1 file changed