ARM: dts: msm: Correct device tree entry for sound node

Sound node for apq8074 device tree is wrongly defined multiple
times. Remove the unnecessary definition from the top level
device tree for apq8074.

Change-Id: I47026813b367e7b846f23924b348284c52fb8cbf
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>