msm: ADSPRPC: Change copy buffer alignment to 128 bytes

When buffers being passed to the remote processor needs to be
copied over to a temporary buffer, 128 byte alignment is being
expected by the algorithms being run on the remote processor.
Update the alignment of the copy buffers to 128 bytes to match
this requirement.

Change-Id: I3d8664c6e8db7af8622d007f800c14ffb71ef47b
Signed-off-by: Sathish Ambley <sathishambley@codeaurora.org>