[ALSA] Fix 'discards qualifiers' compile warnings in pcm.h

Fixed cast messes in pcm.h.
    include/sound/pcm.h: In function ‘hw_param_interval_c’:
    include/sound/pcm.h:800: warning: passing argument 1 of ‘hw_param_interval’ discards qualifiers from pointer target type
Simply redefine the inline functions again for const pointers.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 27f8ef4..76b34b5 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -791,13 +791,13 @@
 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 					     snd_pcm_hw_param_t var)
 {
-	return (const struct snd_mask *)hw_param_mask((struct snd_pcm_hw_params*) params, var);
+	return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 }
 
 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 						     snd_pcm_hw_param_t var)
 {
-	return (const struct snd_interval *)hw_param_interval((struct snd_pcm_hw_params*) params, var);
+	return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 }
 
 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))