ASoC: msm8994: increase the number of channels

WCD9330 supports V/I path for each speaker. Change
increases the number of channels to 4 and can
also support 2 based on mixer controls from userspace.

Change-Id: I58dcde03eeeb0e49db1a9e479645f370ae0ee45d
Signed-off-by: Anish Kumar <kanish@codeaurora.org>