ARM: dts: msm: move audio dtsi inclusion to platform specific file

msm8917-audio dtsi file refers PMIC specific nodes and as MSM8917 is
paired with multiple PMICs, move inclusion of msm8917-audio dtsi to
platform specific dts file.

Change-Id: I9765ea2a5d3fd5a40fb38908c82adfc720f1942f
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>