ARM: dts: msm: Enable Audio over DP in sdmmagpie

Enable Audio over display port feature in
sdmmagpie target. During bringup it was disabled
to fix sound card registration failures. Enable it
back as display port is now functional in sdmmagpie.

CRs-Fixed: 2341542
Change-Id: I8c4a8560f42383a8e685884016f741c6a74c274b
Signed-off-by: Aditya Bavanari <abavanar@codeaurora.org>