ARM: dts: msm: Add fsa4480 node and audio phandle for sdm855

Fsa4480 child is added under i2c to communicate
with fsa switch through i2c bus. Add phandle
of fsa driver under audio to make any switching
for audio adapter orientation.

Change-Id: I085b7059b8c66e46254f03b3fa1629121b2415f7
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>