ASoC: soc.h: fe_compr can be bit field

fe_compr is used at soc-compress, it can be bit field.
This patch move it from int to bit field.

> grep fe_compr -r sound/soc/*
sound/soc/soc-compress.c:               rtd->fe_compr = 1;
sound/soc/soc-pcm.c:            if (!fe->dpcm[stream].runtime && !fe->fe_compr)

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>