ENGR00218421-2 ESAI_ASRC:Add support for p2p virtual device playback

In the origin code, ESAI driver supoprt audio p2p playback by setting
input PCM data's sample rate thought amixer interface.It is ugly and
request user application call amixer control interface everytime before
and playback.

In this patch, user can call the audio p2p playback by writing data to
an special virtual device. Driver would automatically get the params of
input PCM. At the same time, driver would get the output sample rate and
word data. With the data abover, driver can  set ASRC properly and audio
p2p palyback is support.

This patch mainly focus on:
	1 clean old p2p playback way for ESAI.
	2 Setup the output sample rate and word width to virtual
	device's substream_runtime's private data. Everytime the virtual
	device is called, the data abover is used for config ASRC, ESAI,
	and codec.

Signed-off-by: Chen Liangjun <b36089@freescale.com>

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