ALSA: hda/tegra: add driver flag for runtime PM

AZX_DCAPS_PM_RUNTIME flag is added to indicate support for runtime PM.
azx_has_pm_runtime() is used to check if above is enabled and thus
forbid runtime PM calls if needed.
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Reviewed-by: Ravindra Lokhande <rlokhande@nvidia.com>
Reviewed-by: Mohan Kumar D <mkumard@nvidia.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_tegra.c

@@ -520,7 +520,8 @@ MODULE_DEVICE_TABLE(of, hda_tegra_match);
 
 static int hda_tegra_probe(struct platform_device *pdev)
 {
-	const unsigned int driver_flags = AZX_DCAPS_CORBRP_SELF_CLEAR;
+	const unsigned int driver_flags = AZX_DCAPS_CORBRP_SELF_CLEAR |
+					  AZX_DCAPS_PM_RUNTIME;
 	struct snd_card *card;
 	struct azx *chip;
 	struct hda_tegra *hda;