audioservice: add more properties for volume steps and default volumes

This adds logic to properly handle:

1) ro.config.alarm_vol_steps and ro.config.system_vol_steps properties to
   overwrite the max stream volumes for STREAM_ALARM and STREAM_SYSTEM.

2) ro.config.alarm_vol_default and ro.config.system_vol_default properties to
   overwrite the default volume levels used after FDR.

Bug: b/71605702
Test: build image that sets the new properties and verified proper usage.

Change-Id: I8f423456c006596d87addd7156bcef2503e45486
(cherry picked from commit 49eba612207c677fbae9f99265fe59bbd1e3d57c)
(cherry picked from commit 5c31b1f3853d4391aef573369f56d292a7ad3e10)