armhf-target: Modify PulseAudio configuration

On armhf, the following error prevents loopback of bluetooth audio.
W: [alsa-source-HiFi sgtl5000-0] alsa-source.c: Resume failed,
                         couldn't restore original sample settings.

The error can be avoided by modifying the 'alternate-sample-rate'
configuration settings to match 'default-sample-rate'.

Since the minimal image does not contain pulseaudio, add the
change in the armhf target overlay to obtain a target image
specific change.

Apertis: https://phabricator.apertis.org/T3687



Signed-off-by: Frédéric Dalleau <frederic.dalleau@collabora.com>
Reviewed-by: Emanuele Aina <emanuele.aina@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D7410

overlays/armhf-target/etc/pulse/daemon.conf.d/fix-alternate-sample-rate.conf

+# On iMX6.q, the following error is visible preventing audio loopback
+# to start
+# W: [alsa-source-HiFi sgtl5000-0] alsa-source.c: Resume failed, couldn't restore original sample settings.
+#
+# Use this file to override the default value of alternate-sample-rate 
+# to match that of default-sample-rate
+default-sample-format = s16le
+default-sample-rate = 44100
+alternate-sample-rate = 44100