ASoC: mdm9615: Add support for secondary I2S

Currently mdm9615 only has support for primary I2S.  This patch
adds support for secondary I2S in the driver and the routing.

Change-Id: I0cecb58667bd01b176290834f2f39376b11f19c3
Signed-off-by: Damir Didjusto <damird@codeaurora.org>
7 files changed