ARM: dts: msm: Move audio heaps over to use reserved CMA
 regions

Carveout regions are being deprecated. Convert the audio heaps over
to use a reserved CMA region instead of a carveout. At a later time,
the audio regions may be converted over to a fully functional CMA region.

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
[neo: Use increased ion heap size for better 5.1 AAC playback]
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>