Re-enable PulseAudio flat-volumes till we have native PA volume control

buildroot-external/rootfs-overlay/etc/pulse/mycroft-sj201-daemon.conf

@@ -95,4 +95,4 @@ default-sample-rate = 48000
 alternate-sample-rate = 44100
 default-sample-channels = 2
 default-channel-map = front-left,front-right
-flat-volumes = no
+; flat-volumes = no

buildroot-external/rootfs-overlay/etc/pulse/pulseaudio-daemon.conf

@@ -93,4 +93,4 @@ resample-method = ffmpeg
 default-sample-format = s16le
 default-sample-rate = 44100
 alternate-sample-rate = 48000
-flat-volumes = no
+; flat-volumes = no

buildroot-external/rootfs-overlay/etc/pulse/seeed-voicecard-4mic-daemon.conf

@@ -92,4 +92,4 @@ default-sample-format = s16le
 default-sample-rate = 96000
 default-sample-channels = 4
 avoid-resampling = true
-flat-volumes = no
+; flat-volumes = no

buildroot-external/rootfs-overlay/etc/pulse/seeed-voicecard-8mic-daemon.conf

@@ -92,4 +92,4 @@ default-sample-format = s32le
 default-sample-rate = 96000
 default-sample-channels = 8
 avoid-resampling = true
-flat-volumes = no
+; flat-volumes = no