ARM: dts: msm: Add usbc audio support for sdm670 external codec overlay

Add support to enable audio over usb type C for
SDM670 external codec overlay device tree.

Change-Id: Ie7e3b796083a256e5f2b51f71dc8a1361ba8d3c3
Signed-off-by: Rohit Kumar <rohitkr@codeaurora.org>