ASoC: atmel-pcm: split into two file

This patch is split original atmel-pcm.c into new atmel-pcm.c and
atmel-pcm-pdc.c two files. The new atmel-pcm.c is the share routine
while will be used for pdc or dma transfer.

Using SND_ATMEL_SOC_PDC to select using PDC for audio transfer

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --cc sound/soc/atmel/Kconfig
Simple merge

diff --cc sound/soc/atmel/Makefile
Simple merge

diff --cc sound/soc/atmel/atmel-pcm-pdc.c
Simple merge

diff --cc sound/soc/atmel/atmel-pcm.c
Simple merge

diff --cc sound/soc/atmel/atmel-pcm.h
Simple merge

diff --cc sound/soc/atmel/atmel_ssc_dai.c
Simple merge