[ALSA] Add the notes on PM to ens1370/ens1371 sections

Modules: Documentation

Add the notes on PM to ens1370/ens1371 sections.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Documentation/sound/alsa/ALSA-Configuration.txt

@@ -513,6 +513,8 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
 
     This module supports multiple cards and autoprobe.
     
+    The power-management is supported.
+
   Module snd-ens1371
   ------------------
 
@@ -526,6 +528,8 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
 
     This module supports multiple cards and autoprobe.
     
+    The power-management is supported.
+
   Module snd-es968
   ----------------