ASoC: makes rtd->initialized bit field

ASoC: makes rtd->initialized bit field

rtd->initialized is used to know whether soc_init_pcm_runtime()
was correctly fined, and used to call snd_soc_link_exit().
We don't need to have it as bool, let's make it bit-field same as
other flags.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Cc: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://patch.msgid.link/87o752k7gq.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>