staging: vc4_services: bcm2835-audio: Add SNDRV_PCM_INFO_BATCH flag

staging: vc4_services: bcm2835-audio: Add SNDRV_PCM_INFO_BATCH flag

Playing audio with PulseAudio and the bcm2835-pcm driver results
in distorted sound. Timer-based scheduling does not properly work
with bcm2835-pcm since configuring PulseAudio with tsched=0
avoids this problem.

Setting the SNDRV_PCM_INFO_BATCH flag prevents PulseAudio to use
timer-based scheduling by default. Settings this flag makes audio
works out of the box.

Based on: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7f2430cda819a9ecb1df5a0f3ef4f1c20db3f811

Signed-off-by: Dylan Van Assche <me@dylanvanassche.be>
Link: https://lore.kernel.org/r/20210127174348.10192-1-me@dylanvanassche.be
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>