asoc: msm-cpe-lsm: use kmalloc for slim_port_xfer buffers

Use kmalloc instead of dma_alloc_coherent for slim buffers
to support dma_mapping api in interrupt context.

Change-Id: Idf06832b6a3bb30f6a16c168b4e5e5f13ad0a0ab
Signed-off-by: Rohit kumar <rohitkr@codeaurora.org>
Signed-off-by: Meng Wang <mwang@codeaurora.org>