Adding a property entry for the assistant volume.

Ignore-AOSP-First: confidential feature

Adding a system property to be read by AudioService
to override the minimum volume setting for the
assistant stream.

Bug: 277829235
Test: Build only
Change-Id: I08c500c0a3bb040559ca99d1817b7b848deee8c6
diff --git a/private/property_contexts b/private/property_contexts
index c116d4b..058dc29 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -664,6 +664,7 @@
 ro.config.alarm_alert         u:object_r:systemsound_config_prop:s0 exact string
 ro.config.alarm_vol_default   u:object_r:systemsound_config_prop:s0 exact int
 ro.config.alarm_vol_steps     u:object_r:systemsound_config_prop:s0 exact int
+ro.config.assistant_vol_min   u:object_r:systemsound_config_prop:s0 exact int
 ro.config.media_vol_default   u:object_r:systemsound_config_prop:s0 exact int
 ro.config.media_vol_steps     u:object_r:systemsound_config_prop:s0 exact int
 ro.config.notification_sound  u:object_r:systemsound_config_prop:s0 exact string