ALSA: hda - Move codec suspend/resume to codec driver

This patch moves the suspend/resume mechanisms down to each codec
driver level, as we have a proper codec driver bound on the bus now.
Then we get the asynchronous PM gratis without fiddling much in the
driver level.

As a soft-landing transition, implement the common suspend/resume pm
ops for hda_codec_driver and keep the each codec driver intact.  Only
the callers of suspend/resume in the controller side (azx_suspend()
and azx_resume()) are removed.

Another involved place is azx_bus_reset() calling the temporary
suspend and resume as a hackish method of bus reset.  The HD-audio
core provide a helper function snd_hda_bus_reset() instead.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_bind.c

@@ -8,6 +8,7 @@
 #include <linux/mutex.h>
 #include <linux/module.h>
 #include <linux/export.h>
+#include <linux/pm.h>
 #include <sound/core.h>
 #include "hda_codec.h"
 #include "hda_local.h"
@@ -138,7 +139,7 @@ int __hda_codec_driver_register(struct hda_codec_driver *drv, const char *name,
 	drv->driver.bus = &snd_hda_bus_type;
 	drv->driver.probe = hda_codec_driver_probe;
 	drv->driver.remove = hda_codec_driver_remove;
-	/* TODO: PM and others */
+	drv->driver.pm = &hda_codec_driver_pm;
 	return driver_register(&drv->driver);
 }
 EXPORT_SYMBOL_GPL(__hda_codec_driver_register);