pulse: Expose the correct max rate that we support

PulseAudio defines PA_RATE_MAX as the maximum sampling rate that it
supports. We were previously exposing a maximum rate of INT_MAX, which
is incorrect, but worked because nothing was really using a rate greater
than 384000 kHz.

While playing DSD data, we hit a case where there might be very high
sample rates (>1MHz), and pulsesink fails during stream creation with
such streams because it erroneously advertises that it supports such
rates.

Since PA_RATE_MAX is #define'd to (8*48000U), we can't just use it in
the caps string. Instead, we fix up the rate to what we actually support
whenever we use our macro caps.
2 jobs for pulse-rate-fix in 1 minute and 42 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Manifest
passed #45908
manifest

00:00:19

 
  Build
passed #45909
build fedora x86_64

00:01:23